Răspuns :

Explicație:

1. M CuSO4=64+32+4x16=160

160gCuSO4....64gO

800gCuSO4.... X

X=800x64/160=320 gO

2.M CaCO3=40+12+3x16=100

100gCaCO3....12gC

500gCaCO3.... X

X=500x12/100= 60gC

3.M HCl=11+35=36

36gHCl....1gH

73gHCl.... X

X=73x1/36= 2,02gH

4.M HNO3=1+14+3x16=63

14gN....63gHNO3

28gN.... X

X=28x63/14= 126gHNO3

5.M MgO=24+16=40

16gO....40gMgO

8gO....X

X=8x40/16=20gMgO

6.M SO3=32+3x16=80

32gS....80gSO3

16gS.... X

X=16x80/32=40gSO3

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