Answer:
a. 7.75 × 10²² molecules
b. 1.59 × 10²⁷ molecules
c. 6.41 × 10¹⁷ molecules
Explanation:
There are 7.11 × 10²⁴ molecules in 100.0 cm³ of a certain substance. We will use this ratio in our conversion fractions.
a. What is the number of molecules in 1.09 cm³ of the substance?
1.09 cm³ × (7.11 × 10²⁴ molecules/100.0 cm³) = 7.75 × 10²² molecules
b. What is the number of molecules in 2.24 × 10⁴ cm³ of the substance?
2.24 x 10⁴ cm³ × (7.11 × 10²⁴ molecules/100.0 cm³) = 1.59 × 10²⁷ molecules
c. What number of molecules would be in 9.01 × 10⁻⁶ cm³?
9.01 × 10⁻⁶ cm³ × (7.11 × 10²⁴ molecules/100.0 cm³) = 6.41 × 10¹⁷ molecules
