How many atoms of nitrogen are in the chemical formula Ni(NO₃)₂? 2 1 6 3

How many atoms of each element are in the chemical formula Ca(OH)₂?

The following diagram represents an ionic compound in which the red spheres represent cations and the blue spheres represent anions. Which of the following compounds is consistent with the drawing?

a. potassium bromide

b. potassium sulfate

c. calcium nitrate

d. iron(III) sulfate

Serotonin is a compound that conducts nerve impulses in the brain. It contains 68.2% C, 6.86% H, 15.9% N, and 9.08% O. Its molar mass is 176 g/mol Determine its molecular formula.