Answer:
373 K; 253 K
0°C ; -258°C
Explanation:
In order to change Temperatures to Absolute Value (Kelvin) you shoud do this sum:
T° in C + 273 = T° in K
For question 1:
100°C + 273 = 373K
-20°C + 273 = 253K
For question 2:
T° K - 273 = T° C
273 K - 273 = 0°C
15 k + 273 = -258 °C
Answer:
-67.8
Explanation:
Please help! Find the distance to each destination in AU. Use the correct conversion factor.
Explanation:
The question involves converting from one unit (Kilometres) to another unit (Astronomical unit)
The relationship between both units is given as;
1 Km = 6.68459e-9 Au
Kulper belt
6.5 billion km = 6.5e9 Km
1 Km = 6.68459e-9 Au
6.5e9 Km = x
Solving for x;
x = 43.45 Au
Alpha Centauri
44 trillion km = 4.4e13
1 Km = 6.68459e-9 Au
4.4e13 km = x
Solving for x;
x = 294121.83 Au
PLease HELP How many molecules of CO2 are there in 55 grams of CO2?
Answer:
1.2mol
Explanation:
Determine the g/mol of CO2
O - 16g/mol (based on my data booklet)
C - 12.01g/mol (based on my data booklet)
Then add these values up for the g/mol of CO2
16+16+12.01= 44.01g/mol
Then write out the formula
mol = mass/molar mass
n= m/M
n = 55/44.01
n= 1.24971597
and depending on what significant digits you need (based on info, ill do it to 2 terms)
n = 1.2 mol
Molar mass is defined as the mass in grams of one mole of a substance. 1.2 molecules of CO2 are there in 55 grams of CO2.
What do you mean by molar mass ?The term molar mass is defined as the mass of a chemical compound divided by its amount-of-substance measured in moles. It is represented by the symbol "M". The units of molar mass are grams per mole, abbreviated as g/mol.
The weight of one mole of a sample is defined as its molar mass. To calculate a molecule's molecular mass, multiply the subscript by the atomic mass of each element in the molecule, then add the masses of all the elements in the molecule.
Molar mass of Oxygen - 16g/mol
Molar mass of Carbon - 12.01g/mol
Then add these values up for the g/mol of CO₂
Molar mass of CO₂ = 16+16+12.01
= 44.01g/mol
Then,
The number of mole = mass / molar mass
n = m / M
n = 55 / 44.01
n = 1.24971597
n = 1.2 mole
Thus, 1.2 molecules of CO2 are there in 55 grams of CO2.
To learn more about the molar mass, follow the link;
https://brainly.com/question/12127540
#SPJ2
Which of the following pairs of groups of elements cannot form ionic bond? *
IA & VIIA
IA & VA
VIIA & VIIIA
IIA & VIA
Answer:
pq ning kamot oi
Explanation:
hahahsfdydn ebejkakbabaha
Which equation has x = 5 as the solution?
2x = 5
2x = 5
x - 10 = 15
x - 10 = 15
x + 15 =10
x + 15 =10
2x = 10
Answer:
x-10 should be the answer
Substances, such as litmus paper or red cabbage juice, that turn color based on the pH of the solution are called ___.
solutes
solutions
indicators
solvents
Answer:
soluteswws
Explanation:
true or false plz help
Answer:
True
animals can only reproduce sexually
Explanation:
Answer:
It's true, I said true the other time but someone already answered so that's why i couldn't answer right now
Explanation:
6. The Haber process for making ammonia (NH)
gas from its elements was developed by Fritz Haber
during WWI. Haber hoped to use ammonia as
fertilizer to grow food for Germany during the
Allie's blockade. How many liters of hydrogen
would be required to produce 40.0L of ammonia at
STP? N+H, NH,
Answer:
60 Liters
Explanation:
The equation for this reaction is given as;
N2 + 3H2 → 2NH3
From the reaction;
3 mol of H2 produces 2 mol of NH3
At STP;
1 mol = 22.4 L
This means
67.2 L ( 3 * 22.4) of H2 produces 44.8 L ( 2 * 22.4) of NH3
How many L of H2 would produce 40 L of NH3
67.2 = 44.8
x = 40
Solving for x;
x = 40 * 67.2 / 44.8
x = 60 L
the correct formula for the diagram is
1. 2KO
2. K2O
3. K2O
4. KOK2
Answer:
The diagram provided shows K2O, or potassium oxide.
Explanation:
Ok... so, there are two "K2O" options, so I would just choose either and hope for the best. I don't know, maybe it's a mistake...
Answer:
The answer is K2O or dipotassium Monoxide
Which of the following best explains how minerals get into streams?
A. Rainwater that is high in minerals from the atmosphere falls into the stream.
B. The stream absorbs minerals from the plants growing in and around its banks.
C. Rainwater dissolves minerals out of the rocks and soil along the stream during runoff.
D. When water evaporates from the ocean, it takes minerals with it and redeposits them as rainwater into the stream.
please help me
Answer:
C:Rainwater dissolves minerals out of the rocks and soil along the stream during runoff
what gives off greenhouse gases
Answer:
the combustion of fossil fuels, such as coal, oil, and natural gas, to produce electricity.
Imagine the tarantula lost their fangs and the lion lost their sharp teeth. What do you think would happen?
Answer:
I’d still be afraid of them :)) lol thx for the points. Hope you having a good day!
SOMEBODY PLEASE HELP ME
Scenario
On Halloween, children prepared to go trick-or-treating with glow sticks. They prepared two glow sticks (“Glow Stick In” and “Glow Stick Out”) following the directions below. The light intensity was given a value of 10 for both Glow Stick In and Glow Stick Out. At 6:00, the children left Glow Stick In inside of the 25oC house and took Glow Stick Out outside in 10oC weather. At 8:00, they noticed the light intensity of Glow Stick Out at 10oC had decreased to 5. They immediately returned home and noticed the light intensity of Glow Stick In at 25oC had decreased to 7. At 9:00, both glow sticks were at 25oC. Glow Stick In had a light intensity of 6, and Glow Stick Out had a light intensity of 8.
Using at least two scientific principles, write a scientific explanation that includes evidence that justifies or describes the change in light intensity of both glow sticks. Please use claim evidence reasoning.
Answer:
look out for a bot with a link he will get yo ip
Explanation:
Answer: It will become solid again and the form of it will change, because when you heat up something you add energy to it. The particles move further and further apart.
Explanation:
what kind of chemical reaction is this?
Answer:
Ethane Combustion Reaction or just Combustion Reaction
Explanation:
Calculate the percent by mass of benzene in a solution containing 14.2 g of benzene in 28.0 g of
carbon tetrachloride
Answer:
33.65%
Explanation:
total weight of solution=14.2+28=42.2g
benzene=14.2/42.2*100=33.65%
Calculate the number of grams of sulfur in 4.52 mol of sulfur.
Which of the following equations is balanced?
a) HgO -> Hg + 02
b) 2Mg + C12 --> MgCl2
c) P4 + 402 - 2P205
d) 2AgNO3 + CaCl2 --> 2AgCl + Ca(NO3)2
e) None of the above
Answer:
a
Explanation:
a because a
Which of these compounds has the largest percentage by mass of nitrogen? NO N2O NO2 N2O3
The largest mass percentage of nitrogen in NO. Therefore, option (A) is correct.
What is the mass percentage?The percentage by mass of an element in a chemical compound can be described as the number of parts by mass of the element contained in 100 parts by mass of a chemical compound.
The mass percentage of an element can be determined in two steps:
First, calculate the molar mass of the compound and then the percentage of each element by dividing the total mass of the element present in the compound by the molecular mass of the compound multiplied by 100.
Given, the molecular formula of the compound is NO.
The molecular mass of the NO = 30 g/mol
The mass percentage of the Nitrogen = (14/30) × 100 = 46.67 %
the molecular formula of the compound is NO₂.
The molecular mass of the NO = 46 g/mol
The mass percentage of the Nitrogen = (14/46) × 100 = 30.4 %
the molecular formula of the compound is N₂O.
The molecular mass of the NO = 44 g/mol
The mass percentage of the Nitrogen = (14/44) × 100 = 31.81 %
the molecular formula of the compound is N₂O₃.
The molecular mass of the NO = 76 g/mol
The mass percentage of the Nitrogen = (28/76) × 100 = 36.84 %
Learn more about the mass percentage, here:
brainly.com/question/16750428
#SPJ2
please help! Will give Brainliest!
Answer: the answer is c
Explanation:
also, is that canvas? sajdasds
Which stateinent is accurate?
how many atoms in 10.0 g of Ar?
Answer:
1.51 x 10^23 atoms of Ar
Explanation:
Start out with what you're given.
10.0 g of Ar/1 * 1 mol/39.948 g Ar * 6.022*10^23 atoms/1 mol
(It's easier if you write it out.)
You always want to start out w/ what you're given and continue your unit conversions from there. Since you started out with grams of Argon, you want grams of Argon on the bottom to cancel it out. Once you found the unit conversion: 1 mol/39.948 g Ar (molar mass of Ar), now it's time to convert to atoms. Since 1 mol is up on top, put 1 mol on the bottom. Considering you're looking for atoms, use Avagradro's number: 6.022*10^23.
Once simplified, you should get 1.51 x 10^23 atoms of Ar.
***I hope this helps! I also suggest using a mole map, if you're interested.***
The unique shape of DNA allows what
Answer: to copy itself during cell division
Explanation:
Balance the equation by typing in the correct coefficients into the blank spaces in front of each formula. Type 1 if
the coefficient is 1, do not leave space blank
_EH + _ G2 → _EG + _HG2
Answer:
2 in front of every one
Explanation:
HOPE IT HELPS
Find the volume of 2.40 moles of gas whose temperature is 50.0°C and whose pressure is 2.00 atm.
Increasing the amount of current flowing through a wire strengthens
what?
magnetic field
electromagnetism
solenoid
O polarity
Answer:
It will strengthen Electromagnetism
What is the molar mass of H3PO4? (atomic mass: H = 1.01, P = 30.97, O = 15.99)
Answer:
98
Explanation:
molar mass of H3PO4=(3×1)+(31)+(4×16)=3+31+64=98
Suppose astronomers are interested in obtaining an image of a large
area in the sky. Which radiation should astronomers observe if they
want to get images 24 hours a day, quickly and cheaply? Why?
Brainliest to right answer
Shontal compared some of the properties of a marble to a piece
of wood. She placed a marble and a piece of wood in a bucket filled
with water. Shontal observed the wood floating on top of the water,
but the marble sank to the bottom of the bucket. Which statement
best explains why the marble and piece of wood acted differently in
the water?
Answer:
The piece of wood was less dense than the water.
Explanation:
When an object has a lower density than water, it will float on the water.
What is the % of each element in (NH4)2(SO4)?
Nitrogen=21.1999%
Hydrogen=6.1023%
Sulfur=24.2660%
The percent composition of nitrogen, hydrogen, sulfur , oxygen in ammonium sulfate is 21.18%, 6.05%,24.21%,48.43% respectively.
What is percent composition?The percent composition is defined as a convenient way to record concentration of solution.It is a expression which relates solute to solvent as,mass of solute/mass of solution ×100.It helps in elemental analysis of a given compound by giving proportions in which they are present.
Percent composition of N= 28/132.14×100=21.18%
Percent composition of H=8/132.14×100=6.05%
Percent composition of S=32/132.14×100=24.21%
Percent composition of O=64/132.14×100=48.43%.
Thus, the percent composition of nitrogen, hydrogen, sulfur , oxygen in ammonium sulfate is 21.18%, 6.05%,24.21%,48.43% respectively.
Learn more about percent composition,here:
https://brainly.com/question/17505281
#SPJ2
Is the following a physical or chemical change?
Electrolysis of water makes hydrogen and oxygen.
P.s. what is electrolysis?
Answer:
chemical change
Explanation:
electrolysis process by which electric current is passed through a substance to effect a chemical change.