Chemistry 122 d

Question

Calculate the mass of the following: 8.5 x 10-2 mol calcium nitrate

Answer 1

To calculate mass, we need to know the molecular formula of calcium nitrate to figure out the molecular weight (MW) of calcium nitrate. The molecular formula is Ca(NO₃)₂ and the MW would be 164.088 g/mol. The MW can be determined by adding the mass of every atom in the molecular formula.

We can then use the equation MW = grams/mol to determine the mass (in grams) of calcium nitrate. If we rearrange the equation, we can solve for the mass as follows:

grams = mol x MW

Therefore,

mass of calcium nitrate = (164.088 grams/mol) x (8.5 x 10^-2 mol) = 13.95 grams. If this needs to be rounded to the appropriate number of significant figures, the answer would have two significant figures and be 14 grams.

I hope this helps!