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.
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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