Answer:
0.0250 g.
Explanation:
∵ no. of moles (n) = mass / molar mass.
<em>∴ mass of Vitamine C = (n)(molar mass)</em> = (0.000142 mol)(176.12 g/mol) = 0.02501 g = <em>0.0250 g. "three significant figures"</em>
is there supposed be a picture with the question?
Control variable mi amigo
15mL because if it started as 20 mL and went to 35mL when u put in pyrite, the pyrite takes up 15mL