An aqueous solution was found in a bottle labelled "100. ppm Ca2+ standard." Assuming that 1) all calcium ions in the solution came from calcium carbonate (CaCO3 molar mass is 100.0 g/mol) and 2) the standard solution has a density of 1.00 g/mL, How many moles of calcium ions are present in 100. mL of the standard solution?

A) 1.00 x 10^-4 mol

B) 1.00 x 10^-2 mol

C) 1.00 x 10^-5 mol

D) 1.00 mol

E) 1.00 x 10^2 mol