How many grams are there in 9.4 x 1025 molecules of H2?

Mass = 312 g

Explanation:

Given data:

Number of molecules of H₂ = 9.4 × 10²⁵

Mass in gram = ?

Solution:

First of all we will calculate the number of moles of H₂.

1 mole of H₂ contain 6.022× 10²³ molecules

9.4 × 10²⁵ molecules  × 1 mol / 6.022× 10²³ molecules

1.56× 10² mol

156 moles of H₂:

Mass in gram:

Mass = number of mole × molar mass

Mass = 156 mol × 2 g/mol

Mass = 312 g

8 m/s because for him to get the same amount of energy as ray is putting out, bobby, who weighs half as much as ray, needs to run twice as fast.