the mass of one hydrogen atom is 1.67 x 10^-24. Find the mass of 80,000hydrogen atoms

Question

express in scientific notation

Answer 1

80000 · 1.67 x 10^-24

8.0 x 10⁴ · 1.67 x 10^-24

8.0 · 1.67 x 10^-20

13.36 x 10^-20

1.336 x 10^-19

Answer 2

Multiply the mass of 1 atom by 80,000 to get the mass of 80,000 atoms.

 

mass = (1.67 x 10^-24 g)(8 x 10⁴) = 1.336 x 10^-19 g