Question

The molar mass of hydrogen (h2) is 2.02 g/mol. a sample contains 4.00 mol of h2. what is the mass, in grams, of this sample? 1.98 grams 2.02 grams 4.00 grams 8.08 grams

Answer 1

The mass in grams of 4 moles of hydrogen gas is 8.08 grams i.e. in 4 moles of hydrogen 8.08 g of given gas is present.

How do we convert moles to mass?

Mass of any substance will be calculated by using the below formula as:

n = W/M , where

W = required mass

M = molar mass

Given moles of hydrogen (H₂) = 4 moles

Molar mass of hydrogen (H₂) = 2.02 g/mol

Mass of hydrogen will be calculated as:

W = (4)(2.02) = 8.08g

Hence option (4) is correct.

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