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

pure water does not conduct electricity very well. however, when certain substances are dissolved in water, the solution does conduct electricity. you can make a simple device that shows how well a solution conducts electricity. this device uses a flashlight bulb to indicate how well the solution conducts electricity. the better the solution conducts electricity, the brighter the bulb will glow.

explanation: