Question

What is the mass of calcium nitrite in 3M 240 ml solution
A) 120
B) 210
C) 100
D) 130

Answer 1

Ответ:

$n(Ca(NO_2)_2)= C(Ca(N0_2)_2)*V(Ca(N0_2)_2) = 3M* 0,24l=0,72 mol\\m(Ca(NO_2)_2)=n(Ca(N0_2)_2)*M(Ca(N0_2)_2) = 0,72*132=95,04 g$

All answers are wrong. But the closest option is "C".