How many molecules are there in 100 grams of hydrogen?

univerkov | April 28, 2021 | education

To find the required number of molecules in 100 g of hydrogen, we use the equality: m / M = N / Na, whence we express: N = Na * m / M.

Variables and constants: Na – Avogadro’s number (Na = 6.02 * 10 ^ 23 mol-1); m is the mass of taken hydrogen (m = 100 g); M is the molar mass of hydrogen (M = 2.016 g / mol).

Calculation: N = Na * m / M = 6.02 * 10 ^ 23 * 100 / 2.016 = 298.61 * 10 ^ 23 molecules.

Answer: 100 g of hydrogen contains 298.61 * 10 ^ 23 molecules.

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