Ca(OH)2+2HNO3=Ca(NO3)2+2H2O
1) pV=nRT
40*150=n*0.082*293
n= 249.73
2) V(воздуха)=V(O2)/q(O2)=22.4*249.73/0.21=26637.87=26.64 <span> м3.</span>