A1-g sample of the compound hydrogen chloride was analyzed and found to be 2.74 percent hydrogen and 97.3 percent chlorine. what percentage of hydrogen is present in a 2-g sample of hydrogen chloride?

2.74 percent hydrogen and 97.3 percent chlorine are in 2 g of compound.

The same as initial

Explanation:

HCl → H⁺ + Cl⁻

2.74% H means that in 100 g of compund, 2.74 grams are H

97.3 % Cl means that in 100 g of compound, 97.3 grams are Cl

So how many grams of H and Cl, are in 1 g of compound

100 g ___ 2.74 g are H 97.3 g are Cl

1g 2.74/100 97.3/100

0.0274 g are H

0.973 g are Cl

In 2 grams we will find

0.0274 g .2 = 0.0548 g of H

0.973 g .2 = 1.946 g of Cl

(grams / total grams) . 100 = %

(0.0548/2 ) .100 = 2.74%

(1.946 /2) .100 = 97.3%

12.6 L CO2

Explanation:

Mass = 24.7 grams

Molar mass = 44.01 g/mole

Volume at STP = ?

The relationship between these quantities is given as

Number of moles = Mass / Molar mass

Number of moles = 24.7 g /  44.01 g/mole

Number of moles = 0.5612 moles

1 mol = 22.4 L

0.5612 mol = x

x = 0.5612 * 22.4

x = 12.6 L