Question

PLEASE ASAP
Determine the mass, in grams, for 1.20e24 molecules of H₂

Answer 1

3.98g

Step-by-step explanation:

Given parameters:

Number of molecules = 1.2 x 10²⁴ molecules

Unknown:

Mass of H₂ = ?

Solution:

To find the mass of this molecule, we use the expression below:

Mass = number of moles x molar mass

Molar mass of H₂ = 2(1) = 2g/mol

6.02 x 10²³ molecules are contained in 1 mole of a substance

So; 1.2 x 10²⁴ molecules will have
`(1.2 x 10^(24) )/(6.02 x 10^(23) )` = 1.99 moles of H₂

Mass of H₂ = 1.99 x 2 = 3.98g