Question

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

Answer 1

Answer:

3.98g

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 $\frac{1.2 x 10^{24} }{6.02 x 10^{23} }$    = 1.99 moles of H₂

Mass of H₂   = 1.99 x 2  = 3.98g