Chemistry College

A sample of an unknown compound is vaporized at 130°C . The gas produced has a volume of 1280mL at a pressure of 1.00 atm and it weighs 4.03g
Assuming the gas behaves as an ideal gas under these conditions, calculate the molar mass of the compound. Round your answer to 3 significant digits.

Answers

Answer 1
This is an ideal gas law question. It uses the ideal gas law equation, PV =nRT.
P = pressure, V = volume, n = moles, R is the constant, and T is temperature in kelvin. The temperature needs to be converted Kevin first. To convert from Celsius to Kevin, you add 273, meaning that the temp in Kevin is 403K. Then plug all the info into the equation to solve for moles.
(1.00atm)(1.280L)=n(0.0821)(403K)
n = 0.0387moles

To find molar mass, divide mass by moles.

4.03g / 0.0387moles = 104.17g/mol

104g/mol rounded to three significant digits

Related Questions

What physical property of matter determines the earth ?

Answers

Answer:

Density is a physical property that is determined by dividing the mass of a given amount of a substance by its volume.

Explanation:

form a belt between Mars and Jupiter.
A)
Asteroids
B)
Comets
C)
Meteors
D)
Stars

Answers

Answer:

A

Explanation:

A 5.0 L air sample at a temperature of -50°C has a pressure of 800.00 mmHg. What
the new pressure if the temperature is raised to 100°C and the volume expands to 7.0
L?

Answers

Answer:

956 mmHg

Explanation:

The combined gas law states that P1V1/T1 = P2V2/T2 when moles of gas are constant. We're looking for P2, so solve all of that for P2. Make sure you convert your temperatures to Kelvin by adding 273 to the Celsius temperatures.

P2 = P1V1T2/T1V2

P1 = 800.00 mmHg

V1 = 5.0 L

T2 = 100 + 273 = 373 K

T1 = -50 + 273 = 223 K

V2 = 7.0 L

P2 = (800.00 mmHg)(5.0 L)(373 K) / (223 K)(7.0 K) = 956 mmHg

Given the following chemical reaction:
N2 + 202 --> 2 NO2
How many liters of N2 are needed to react with 10 liters of Q? Explain

Answers

Answer:

1

Explanation:

one volume of nitrogen to react

What is another name for a mole?
O A. Rutherford's number
O B. Mendeleev's number
O C. Dalton's number
D. Avogadro's number

Answers

Answer: D Avogadro’s Number

Explanation:

Another name for a mole is Avogadro's number. option D) is correct.

What is a Mole?

A mole refers to the amount of a substance that contains as many elementary units as can be found in 12g of Carbon-12. It can also be a number of a substance /particles, such as atoms or ions. molecules or electrons.  The number of particles is approximately 6.02* 10²³ in magnitude and is called Avogadro's number of particles. it can be denoted with 'mol'.

Formula for calculating mole.

n = N/Nₐ

Where,

n = number of moles of the substance (or elementary entity)

N = total number of elementary entities in the sample

Nₐ= Avogadro constant.

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What important material is absorbed by your digestive system besides water

Answers

Answer:

The monosaccharides, amino acids, bile salts, vitamins, and other nutrients are absorbed by the cells of the intestinal lining

Explanation:

Answer:

The monosaccharides, amino acids, bile salts, vitamins, and other nutrients are absorbed by the cells of the intestinal lining.

Explanation:

What is the scaling factor if the molar mass of
this compound, having an empirical formula of
ch2o, is 150 g/mol?

Answers

Answer:

The scaling factor is 5.

Explanation:

Hello there!

In this case, since the scaling factor is defined as the ratio of the molar mass of the molecular formula (complete) to the empirical formula (simplified), it is possible to compute it for the empirical formula of CH2O whose molar mass is 30 g/mol (12+2+16) as shown below:

[tex]sf=150/30=5[/tex]

Therefore, we can also infer that the molecular formula would be:

[tex]C_5H_1_0O_5[/tex]

Best regards!

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