how many grams are there in 9.4 x 10 to the 25 molecules of h2

To find the number of grams in 9.4 x 10^25 molecules of H2, we need to follow these steps:

1. Determine the molar mass of H2: Hydrogen has an atomic mass of approximately 1 gram/mole. Since H2 is a diatomic molecule, its molar mass is 1g/mole * 2 = 2g/mole.

2. Use Avogadro's number to find the number of moles: Avogadro's number is 6.022 x 10^23 molecules/mole. So, 9.4 x 10^25 molecules of H2 is (9.4 x 10^25) / (6.022 x 10^23) = approximately 156.14 moles.

3. Multiply the number of moles by the molar mass to find the mass in grams: 156.14 moles * 2 g/mole = 312.28 grams.

So, there are approximately 312.28 grams in 9.4 x 10^25 molecules of H2.