What is the percent composition by mass of oxygen in ca(no3)2 (gram-formula mass = 164 g/mol)? a.9.8%b.29%c.48%d.59%?

A. 9.8%

Explanation:

Percentage Composition = (Mass of element /  Mass of compound) * 100

Mass of oxygen = 16g

Molar mass of Ca(NO3)2

Where;

Ca = 40

N = 14

O =16

Molar mass = 40 + 2[14 + 3(16)] = 164

Substituting into the formular;

Percentage composition = (16 / 164) * 100

Percentage Composition = 0.0975 * 100

Percentage Composition = 9.75% ≈ 9.8 %

Correct option = A

hurricanes form when warm, moist air from the ocean surface quickly rises into the atmosphere and forms storm clouds and rain. when the clouds are formed, heat is released which warms the cool air in the upper regions of the atmosphere so that the cycle can continue. which two phases of the water cycle are repeated in this process?

what is the question here. i think you messed up.