A pure gas contains 81.71% carbon and 18.29% hydrogen by mass. Its density is 1.97 g/L

Expert Solution

element % A.Wt relative number simple ration simplest ratio

C 81.71 12 81.71/12 = 6.8 6.8/6.8 = 1 1*3 = 3

H 18.29 1 18.29/1 = 18.29 18.29/6.8 = 2.68 2.68*3 = 8

The empirical formula = C3H8

The empirical formula mass = 12*3 + 8 = 44g/mol

molecular formula = ( empirical formula)n

At STP

molar mass = volume * density

= 22.4L/mole* 1.97g/L = 44g/mole

n = molar mass/empirical formula mass

= 44/44 = 1

molecular formula = (C3H8)1 = C3H8

queen_honey_blossom answered 1 year ago

An unknown gas contains 85.63% carbon and 14.37% hydrogen by mass. if 2.00 L of the...

An unknown gas contains 85.63% carbon and 14.37% hydrogen by mass. if 2.00 L of the gas at 298 K and 0.420 atm and weights 1.926 g A) What is the molar mass of the unknown gas? B) What is the empirical formula of the gas? C) What is the molecular formula of the gas?

An unknown gaseous hydrocarbon contains 85.63 % carbon. If its density is 0.488 g/L at 0.355...

An unknown gaseous hydrocarbon contains 85.63 % carbon. If its density is 0.488 g/L at 0.355 atm and 100°C, what is the molecular formula of the gas?

Carbon monoxide gas reacts with hydrogen gas to form methanol. CO(g)+2H2(g)→CH3OH(g) A 1.05 L reaction vessel,...

Carbon monoxide gas reacts with hydrogen gas to form methanol. CO(g)+2H2(g)→CH3OH(g) A 1.05 L reaction vessel, initially at 305 K, contains carbon monoxide gas at a partial pressure of 232 mmHg and hydrogen gas at a partial pressure of 357 mmHg . Identify the limiting reactant and determine the theoretical yield of methanol in grams

1）Ethane gas is composed of carbon and hydrogen. Its decomposition produces 4 parts by mass of...

1）Ethane gas is composed of carbon and hydrogen. Its decomposition produces 4 parts by mass of carbon to 1 part by mass of hydrogen. The relative mass of carbon atoms is 12 and that of hydrogen atoms is 1. Find out how many hydrogen atoms are combined with each carbon atom in ethane. Show all your work. 2 ）Convert the following: a 114 ps to s b 67.2 mm3 to mL c 17.2 ng to Mg 3）What is the mass...

a 0.580 g sample of a compound containing only carbon and hydrogen contains .480 g of...

a 0.580 g sample of a compound containing only carbon and hydrogen contains .480 g of carbon and .100g of hydrogen. At STP 33.6mL of the gas has a mass of .087g. What is the molecular formula for the compound? The answer should be C4H10. Please explain with steps. Thank you.

A mass of 7.75 g carbon monoxide is reacted with 8.04 g hydrogen to form methanol....

A mass of 7.75 g carbon monoxide is reacted with 8.04 g hydrogen to form methanol. CO(g) + 2 H2(g) → CH3OH(g) The reaction is performed in a 5.00 L flask at 85.0 °C and proceeds to completion. What is the partial pressure (in mmHg) of each of the three species following completion of the reaction? What is the total pressure in the flask? CO =? mmHg H2 =? mmHg CH3OH =? mmHg Total =? mmHg

An ancient club is found that contains 100 g of pure carbon and has an activity...

An ancient club is found that contains 100 g of pure carbon and has an activity of 6 decays per second. Determine its age assuming that in living trees the ratio of 14C/12C atoms is about 1.10 × 10-12. Note that the half life of carbon-14 is 5700 years and the Avogadro number is 6.02 × 1023.

An ancient club is found that contains 190 g of pure carbon and has an activity...

An ancient club is found that contains 190 g of pure carbon and has an activity of 4.5 decays per second. Determine its age assuming that in living trees the ratio of (14C/12C) atoms is about 1.00 × 10-12. Note that the half life of carbon-14 is 5700 years and the Avogadro number is 6.02 × 1023. Please answer in years please

An equilibrium mixture contains 0.6500.650 mol of each of the products (carbon dioxide and hydrogen gas)...

An equilibrium mixture contains 0.6500.650 mol of each of the products (carbon dioxide and hydrogen gas) and 0.2000.200 mol of each of the reactants (carbon monoxide and water vapor) in a 1.00 L container. CO(g)+H2O(g)−⇀↽−CO2(g)+H2(g)CO(g)+H2O(g)↽−−⇀CO2(g)+H2(g) How many moles of carbon dioxide would have to be added at constant temperature and volume to increase the amount of carbon monoxide to 0.3000.300 mol once equilibrium has been reestablished?

A hydrogen-rich gas stream contains 1.0 mole % carbon monoxide. It is desired to use a...

A hydrogen-rich gas stream contains 1.0 mole % carbon monoxide. It is desired to use a microporous ceramic membrane for separating carbon monoxide (CO) from hydrogen gas at a pressure of 1 atm and a temperature of 400C. The average pore diameter of the membrane is 15 nm and the void fraction is 0.30. a) Estimate the molecular diffusivity of CO in a mixture with H2 b) Determine the Knudsen diffusion coefficient and the effective diffusion coefficient for CO in...

Question