What is the mass of 22.4 l of h2 at stp?

1.01 gram
2.02 grams
11.2 grams
22.4 grams

Option (b) is the correct answer.

Explanation:

STP means standard temperature and pressure. At this condition pressure is 1 atm, volume is 22.4 L and temperature is 298 K.

Therefore, using ideal gas equation we will calculate the number of moles as follows.

                             PV = nRT

                                 n = 0.903 mol

                                    = 1 mol (approx)

Hence, it is known that molar mass of hydrogen molecule is 2 g/mol. Therefore, calculate mass of at STP as follows.

                 Number of moles =

                       1 mol =

                          mass = 2.02 g

Thus, we can conclude that the mass of 22.4 L of H2 at STP is 2.02 grams.

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the answer is 75.0%.