1)
дано
m(CH3OOC2H5)=65 g
---------------------------
m(C2H5OH)-?
X 65
CH3COOH+C2H5OH-->CH3COOC2H5+H2O
46 88
M(C2H5OH)=46 g/mol
M(CH3COOC2H5)=88 g/mol
X/46 = 65 /88
X=34 g
ответ 34 г
2)
дано
Cм=0.3M
V(HCOOH)=1.5 L
HCOOH
--------------------
m(HCOH)-?
M(HCOOH)=46 g/mol
m(HCOOH)=Cм(HCOOH)*M(HCOOH)*V(HCOOH)=0.3*46*1.5=20.7 g
ответ 20.7 г