Balance the chemical equation using the smallest possible whole number stoichiometric coefficients

Given that :

hydronium ion concentration of 0.072 M

[H3o^+] = 0.072

We know that :

The moles of NH4+ ions that are dissolved in 0.750 kg of H2O when the concentration of (NH4)3po4 ( ammonium phosphate) is 0.400 m is 0.9 mol

0.400 moles (NH4)3PO4 is dissolved in water.

So it is 0.4x0.75=0.3 mol (NH4)3PO4 in 0.75 kg water

1 mol (NH4)3PO4 contains 3 NH4+ ions .

So we have 0.3x3=0.9 mol NH4+ ions in 0.75 kg water

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Answer:

I think that the most important thing that I've learned in the course was stoichiometry. I really liked balancing equations and calculating yields.

Answer:

158 L.

Explanation:

What is given?

Pressure (P) = 1 atm.

Temperature (T) = 112 °C + 273 = 385 K.

Mass of methane CH4 (g) = 80.0 g.

Molar mass of methane CH4 = 16 g/mol.

R constant = 0.0821 L*atm/mol*K.

What do we need? Volume (V).

Step-by-step solution:

To solve this problem, we have to use ideal gas law: the ideal gas law is a single equation which relates the pressure, volume, temperature, and number of moles of an ideal gas. The formula is:

Where P is pressure, V is volume, n is the number of moles, R is the constant and T is temperature.

So, let's find the number of moles that are in 80.0 g of methane using its molar mass. This conversion is:

So, in this case, n=5.

Now, let's solve for 'V' and replace the given values in the ideal gas law equation:

The volume would be 158 L.

Answer:

photosynthesis does not take place in animals

Explanation:

it doesn't because animals do not have plant cells

Answer:

Nitrogen and Fluorine, Tetrafluorohydrazine

Explanation:

1) Concentration of Na+

1.1- List the known quantities.

Molarity: 0.304 M Na2SO4.

Volume: 15.0 mL

M= mol/L

1.2- Set the equation

The ion-molecule ratio is 2 Na atoms: 1 molecule Na2SO4.

The concentration of Na+ is 0.608 M.

2) Concentration of SO4 (2-)

2.1- List the known quantities.

Molarity: 0.304 M Na2SO4.

Volume: 15.0 mL

M= mol/L

2.2- Set the equation

The ion-molecule ratio is 1 SO4 (2-): 1 molecule Na2SO4.

The concentration of SO4 (2-) is 0.304 M.

3) Concentration of K+

3.1- List the known quantities.

Molarity: 0.200 M KCl.

Volume: 34.6 mL

M= mol/L

3.2- Set the equation

The ion-molecule ratio is 1 K+: 1 molecule KCl.

The concentration of K+ is 0.200 M.

4) Concentration of Cl-

4.1- List the known quantities.

Molarity: 0.200 M KCl.

Volume: 34.6 mL

M= mol/L

4.2- Set the equation

The ion-molecule ratio is 1 Cl-: 1 molecule KCl.

The concentration of Cl- is 0.200 M.

.

According to the chemical equation one mol of (NH4)2CO3 produces 2 mol of NH3

When expresed in mass 96.09 grams of (NH4)2CO3 produce 34 grams of NH3 when we keep this proportion for the 5 grams we obtain:

Valence electrons are present in Fe is 8 and inner is 20 and outer is 8

A valence electron is the outer shell associated with an atom and that can participate in the formation of a chemical bond if the outer shell is not closed and in iron the atomic number of iron is 26 and hence, the valence electrons that are present in iron are 8 the outer electrons in iron are 8. The inner electrons in iron are 20

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Mia is a nanny for three small children their parents have laid out dinner, including broiled chicken tenders, broccoli, and steamed carrots when Mia puts the plates in front of them, one of the kids makes a face and announces, “I don’t eat broccoli!” then best way for Mia to respond is “Why don’t you at least take one bite?”

Here according to the given data mia is a nanny for three small children. their parents have laid out dinner, including broiled chicken tenders, broccoli, and steamed carrots when Mia puts the plates in front of them, one of the kids makes a face and announces, “I don’t eat broccoli!” then mia respond is “Why don’t you at least take one bite?” because mia is encouraging the small children to eat the broccoli because broccoli is the good for our health and it is packed with vitamins and minerals and it has a good source of calcium

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First, we must know this:

Weight is a kind of force, P = m x g

m is the mass of the object and g is the acceleration of gravity

The unit of P in SI is N = kg m/(s)^2

Let's convert our mass in kg => 100,000 g = 100 kg

The acceleration of gravity = 9.8 m/(s)^2 (we assume this value)

Now, P = 100 kg x 9.8 m/(s)^2 = 980 N (newton)

Answer: 980 N

Answer:

you see, if you look at the chart closer, it explains the steps you need to understand.

Explanation:

the graph is easy to look at, first step is easy, now the chart explains how and what's there.

Based on the chemical equation 2 moles of oygen gas produces 1 mole of carbon dioxide, using this relationship we can set up an equation that would determine the amount of moles needed to produce 5.67 moles of carbon dioxide:

Answer: It will require 11.34 mol O2 gas.

The number of protons, neutrons, and electrons in isolated ions having the following nuclear symbols:

a) ¹⁹F⁻ has 9 protons 10 neutrons 10 electrons

b) ²⁴Mg²⁺ has 12 protons 12 neutrons 10 electrons

c) ⁵⁶Fe³⁺ has 26 protons 30 neutrons 23 electrons

a) ¹⁹F⁻

The atomic no. of F is 9 . atomic number shows the no. of protons. the no. of protons is 9. number of protons = no. electrons for neutral atom but here -1 shows one extra electron. number of electrons is 10. neutrons is the difference in mass no. and the atomic number. number of neutrons = 19 - 9 = 10

¹⁹F⁻ has 9 protons 10 neutrons 10 electrons

b) ²⁴Mg²⁺

The atomic no. is 12 . number of protons is 12. +2 represents 2 electrons are removed. number of electrons is 10. neutrons = mass no. - atomic no. number of neutrons = 30

²⁴Mg²⁺ has 12 protons 12 neutrons 10 electrons

c) ⁵⁶Fe³⁺

The atomic number is 26. number of protons = 26. +3 means three electrons are removed. number of electrons are 23. neutrons = 56 - 26 = 30.

⁵⁶Fe³⁺ has 26 protons 30 neutrons 23 electrons

Thus, The number of protons, neutrons, and electrons in isolated ions having the following nuclear symbols:

a) ¹⁹F⁻ has 9 protons 10 neutrons 10 electrons

b) ²⁴Mg²⁺ has 12 protons 12 neutrons 10 electrons

c) ⁵⁶Fe³⁺ has 26 protons 30 neutrons 23 electrons

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Answer

The balanced complete ionic equation is:

Mg²⁺(aq) + SO₄²⁻(aq) + 2Na⁺(aq) + 2OH⁻(aq) → Mg(OH)₂(s) + 2Na⁺(aq) + SO₄²⁻(aq)

The net ionic equation is:

Mg²⁺(aq) + 2OH⁻(aq) → Mg(OH)₂(s)

Explanation

When aqueous NaOH and MgSO4 are combined, solid Mg(OH)2 and aqueous Na2SO4.

The balanced complete molecular equation for the precipitation reaction is:

MgSO₄(aq) + 2NaOH(aq) → Mg(OH)₂(s) + Na₂SO₄(aq)

The balanced complete ionic equation for the precipitation reaction is:

Mg²⁺(aq) + SO₄²⁻(aq) + 2Na⁺(aq) + 2OH⁻(aq) → Mg(OH)₂(s) + 2Na⁺(aq) + SO₄²⁻(aq)

The spectator ions are SO₄²⁻(aq) and Na⁺(aq). Therefore, condensing the complete ionic equation will result in a net ionic equation given below:

Mg²⁺(aq) + 2OH⁻(aq) → Mg(OH)₂(s)

Answer:

The scenario that is the best example of energy transfer by convection is: "warm air near the equator rising higher in the atmosphere".

Explanation:

Convection is the way of transmitting heat through a liquid or gaseous medium, so the scenario that is the best example of energy transfer by convection is: "warm air near the equator rising higher in the atmosphere".

That is the best example, because the heat is transmitted throgh the air (gas), from the warmer air going up, while the cooler air goes down.

This is known as natural convection.

answer and explanation

Charles's law tells use the relationship between volume and temperature of a gas by the equation

V1/T1 = V2/T2

from the data provided we find V2 by:

37/2.5 = V2/6.3

V2 = 93.2 degrees

the gas would have to be heated to 93.2 degrees to expand in volume to 6.3L

Answer:

because it has 4 figure 2 atoms

Explanation:

1) Convert molecules of water into moles of water.

2) Use the moles of water in step 1 to find out the number of moles of Epsom salt

3) Find the molecular mass of one mol of Epsom salt.

Mg: 24.30 g/mol

S: 32.065 g/mol

O: 15.999 g/mol

H: 1.008 g/mol

The molecular mass of Epsom salt (MgSO4 * 7H2O) is

(24.30*1)+(32.065*1)+(15.999*4)+(1.008*14) +(15.999*7) =826.3571 g/mol

4) Convert moles of Epsom salt into grams of Epsom salt.

Answer

A solution with pH of 5.

Explanation

Given:

[H₃O⁺] = 1.00 x 10⁻⁵ M

To know the solution that has a hydronium ion concentration, [H₃O⁺] of 1.00 x 10⁻⁵ M, you need to calculate the pH of the solution using the formula given below:

Put [H₃O⁺] = 1.00 x 10⁻⁵ M into the pH formula:fof

Step 1 - Finding the concentration in g/L

We know the density of the solution is 1.072 g/ml, which means there are 1.072 g in each ml of solution. This mass corresponds to both water and ethyleneglycol.

Since the percentage in mass of ethyleneglycol is 56%, we can calculate how much ethyleneglycol there is in 1 ml of solution:

The concentration of ethyleneglycol would be thus 0.6 g/ml.

To convert it to g/L, we just have to multiply it by 1000, because 1L = 1000ml:

The concentration of ethyleneglycol is this solution is thus 600 g/L.

Step 2 - Converting this concentration to mol/L

To convert now to mol/L (M), we just have to divide the concentration by the molar mass of ethyleneglycol (62.07 g/mol):

Note the concentration is a rather high one. We will have to dilute it.

Step 3 - Preparing a 0.350 M solution

We know the final volume of the solution must be 500 ml, and we also know its final concentration (0.350 M). Since we already know its inicial concentration as well, we can use the following formula for dilutions:

Plugging the values in the equation:

Step 4 - Describing how to prepare the solution

As we have calculated in step 3, we would need 18.11 ml of the original solution (9.66 M) for the dilution. We would then add water untill we get the final volume of 500 ml (add 481.89 ml of water)

The resulting solution would be a 500 ml solution of 0.350 M ethyleneglycol.

Phase transitions is when a substance go through a change in its physical state, for example, solid to liquid, liquid to gas, etc. Energy in this case must be absorbed or released, and not necessarily it will be seen a change of temperature in this case. Mathematically, we calculate the energy released or absorbed by using the molar enthalpy of vaporization or molar enthalpy of fusion, as we can see in the following formulas:

ΔH = m*ΔHvap

ΔH = m*ΔHfusion

So phase transition is the energy required for a substance to change the physical state.

Alkaline earth metals are the elements that make up group 2 of the Periodic Table. Like Be, Mg, Ca, Sr, Ba and Ra.

a) Let's do the electronic distribution of two elements of group 2:

Mg atomic number is 12

Ca atomic number is 20

Eletronic distribution:

Mg - 1s² 2s² 2p⁶ 3s²

Ca - 1s² 2s² 2p⁶ 3s² 3p⁶ 4s²

Valence shell is marked on the electronic distribution. It means that both have 2 electrons in the valence shell.

b) To predict the ionic charge of the ion, we need to lose or gain electrons in order to obtain 8 electrons in the valence shell. So for alkaline earth metals, they need to lose 2 electrons in order to obtain 8 electrons in the valence shell:

Mg - 1s² 2s² 2p⁶ 3s²

Loses 2 electrons:

Mg²⁺ - 1s² 2s² 2p⁶ - 8 electrons in the valence shell

So, the ionic charge of the ion that alkaline earth metals form is 2+.

ClO-  + 3H2O--> ClO4-  + 6H+   + 6e- is  balance equation reaction

Stoichiometric coefficients for the reactants and products are necessary to balance chemical equations. Because a chemical equation must adhere to the principles of mass conservation and constant ratios, the same amount of atoms of each element must be present on two of the reactant and product sides of the equation.

The reactants and products of a chemical reaction are symbolically expressed in chemical equations using the appropriate chemical formulas. The portion of the chemical equation that is on the reactant side is to the left of the sign "," and to the right of the arrow symbol, respectively.

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1. Yes, radioactive material leave the containment building.

2. Yes, anything that comes in contact with radioactive material leave the containment building.

In order to ensure that they do not endanger the people or the environment, nuclear power plants occasionally leak radioactive gases and liquids into the environment.

The nuclear power plant's plume of radioactive pollutants can settle and contaminate buildings, people outside, food, water, and livestock. Additionally, breathing in radioactive substances or consuming contaminated food or beverages can cause radioactive compounds to enter the body.

A reinforced steel, concrete, or lead building that houses a nuclear reactor is called a containment building. It is intended to confine the escape of radioactive steam or gas to a maximum pressure between 275 and 550 kPa in the event of any emergency (40 to 80 psi).

The main means of avoiding contamination from entering the environment, coming into contact with, or ingesting individuals is containment. Radioactive material is distinct from radioactive contamination since it must be contained.

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Answer:

0.009: only 1 significant figure, since all zero digits are leading zeros;

0.030: there are 2 significant figures;

140: there are 3 significant figures (a simple way to check is convert this number to the scientific notation keeping the same amount of digits: 1.40 x 10^2);

2000: there are 4 significant figures;

80.30: there are 4 significant figures;

80060: there are 5 significant figures

0.05200: there are 4 significant figures.

Explanation:

The question requires us to identify the numbr of significant figures for each of the following values:

0.009

0.030

140

2000

80.30

80060

0.05200

Significant figures or significant digits of a number can be defined as the digits that define the resolution or precision of a number. In other words, the significant figures of a number are the reliable digits necessary to indicate the quantity of something.

There are a few rules to identify the amount of significant digits of a number. We can summarize them as:

- non-zero digits that are in the number are significant;

- zeros between two non-zero digits are significant;

- leading zeros (zeros to the left of the first non-zero digit) are not significant, while zeros to the right of the last non-zero digit in a decimal number are signifcant (for example, 0.005200 -> these zeros are not significant; 0.005200 -> these zeros are significant);

- zeros to the left of the last non-zero digit in an integer number may or may not be significant, depending on the measurement resolution.

Next, let's analyze the numbers given by the question:

0.009: only 1 significant figure, since all zero digits are leading zeros;

0.030: there are 2 significant figures;

140: there are 3 significant figures (a simple way to check is convert this number to the scientific notation keeping the same amount of digits: 1.40 x 10^2);

2000: there are 4 significant figures;

80.30: there are 4 significant figures;

80060: there are 5 significant figures

0.05200: there are 4 significant figures.

-

In order to calculate the percent yield of a reaction we will use:

%yield = (actual yield/theoretical yield) * 100

%yield = (0.145/0.105) * 100

%yield = 138%

Answer:

See attached worksheet

Explanation:

As the worksheet explains, the fiorst step is to have a balanced equation of the prioction of hydrogen gas from magnesium and hydrochloric acid.

2Mg + 2HCl ⇒ H2 + 2MgCl

Then convert the mass of manesium into moles Mg (0.045 moles Mg)

Since the balanced equation promises us that we'll get 1 mole of H2 for every 2 moles of Mg, we can predict that the 0.045 moles of Mg will be enough to make (0.045 moles Mg)*(1 mole H2/2 moles Mg) = 0.0225 moles of H2.

At 22.4 l/mole at STP, this means the gas volume of H2 is (0.0225 moles)*(22.4L/mole) = 0.504 L of H2 at STP.

Since the lab is not at STP, the above volume must be adjected for actual lab conditions.  Use the combined gas law:

P1V1/T1 = P2V2/T2

where P is pressure, V is volume, and T is temperature, in Kelven.  (add 273.15 to C for Kelvin).  The subscripts 1 and 2 represent starting (1) and final (2) conditions.

Stand pressure in kPa is 101.3 kPa.

We want V2, so rearrange the equation:

 V2 = V1(T2/T1)(P1/P2)

Note that I've arranged the tempaerature and pressure values as ratios.  It helps guide the process for cancelling units and understanding the impact of changes in these values.

See the worksheet for more details.  V2 is calculated to be 0.542L (542ml) of H2 under the lab conditions.  

Percent theorectical yield is the amount obtained divided by the amount expected:

 (145ml)/(542ml) = 26.8% theorectical yield.

To prepare sich solution, we would have to have a good measure of the solution added and of the final volume.

We may use a volumetric pipet to prepare it, but we won't prepare in a pipet, we would use it to measure something we would add.

A beaker or an Erlenmeyer flask don't have a good precision for volume measure, so they are bad to prepare the solution.

So, the best is to prepare in a volumetric flask, because its volumetric meaures is very precise.

When a solid warms up and changes to a liquid, this is a physical change.

A chemical reaction results in the formation of a new molecule. This are correct statement.

Physical changes are defined as the changes which affects the form of the chemical substance, but never changes its chemical composition. Thus, this type of changes are used to separate the mixtures into their component compounds, but it can not usually be used to separate the compounds into chemical elements or simpler compounds.

Chemical changes is a type of reaction which occur when a substance combines with another compound to form a new substance, called as chemical synthesis or, simultaneously, chemical decomposition into two or more different type of substances. These are not reversible in nature except by further chemical reactions.

Thus, we concluded that When a solid warms up and changes to a liquid, this is a physical change.

A chemical reaction results in the formation of a new molecule. This are correct statement.

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From the question, we are given the following parameters

Moles of Carbon = 5.11 moles

Acording to the Avogadro's constant;

The number of atoms contained in 5.11 moles of Carbon will be expressed as:

Therefore the number of carbon atoms that are in 5.11 moles of C is

3.08 * 10²⁴atoms