Question

1.Cate grame de substanta se gasesc in:
a) 2 moli Cu CO3 ;
b)5 moli N2 O5;
c)3 moli Ca COH2.

2.In cate grame de CO , COO2, FE2O3 se gasesc 48 grame oxigen .

Answer 1

1.a)Masa molara CuCO3=1*64+1*12+3*16=124g
1mol CuCO3...................124gCuCO3
2moli CuCO3....................x
x=2*124/1=248gCuCo3
b)Masa molara N2O5=2*14+5*16=108g
1mol N2O5.....................108gN2O5
5moli.............................x
x=5*108/1=540gN2O5
c)Masa molara CaCOH2=1*40+1*12+1*16+2*1=70g
1mol CaCOH2............................70g
3moli CaCOH2...........................x
x=3*70/1=210gCaCOH2

2.a)Masa molara CO=1*12+1*16=28
28g CO...................16gO
x.............................48gO
x=28*48/16=84gCO
b)Masa molara COO2=1*12+3*16=60g
60g COO2......................48gO
x...................................48gO
x=60*48/48=60gCOO2
c)Masa molara Fe2O3=2*56+3*16=160g
160g Fe2O3.......................48gO
x.......................................48gO
x=160*48/48=160g Fe2O3