Question

what mass of solid calcium nitrate, in grams, should be measured out to prepare 450. ml of a .100 M solution

Answer 1

volume , V = 450 mL

= 0.45 L

we have below equation to be used:

number of mol,

n = Molarity * Volume

= 0.1*0.45

= 4.5*10^-2 mol

Molar mass of Ca(NO3)2 = 1*MM(Ca) + 2*MM(N) + 6*MM(O)

= 1*40.08 + 2*14.01 + 6*16.0

= 164.1 g/mol

we have below equation to be used:

mass of Ca(NO3)2,

m = number of mol * molar mass

= 4.5*10^-2 mol * 164.1 g/mol

= 7.38 g

Answer: 7.38 g