1.Oblicz stosunek masowy pierwiastków w chlorków wapnia. 2.Oblicz procent masowy pierwiastków w fosforanie V magnezu .
1.chlorek wapnia CaCl2
mCa-40
mCl2-70
40/70
4:7<---stosunek mas
2.fosforan (V) magnezu-Mg₃(PO₄)₂
mMg₃(PO₄)₂=3*24+2*31+8*16=262
Mg-72u
262-----100%
72u-----x%
x=72*100/262
x=27,48
P-62
262----100%
63------x%
x=63*100/262
x=24,04
O-128
128----x%
x=128*100/262
x=48,85
Liczę na naj.
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1.chlorek wapnia CaCl2
mCa-40
mCl2-70
40/70
4:7<---stosunek mas
2.fosforan (V) magnezu-Mg₃(PO₄)₂
mMg₃(PO₄)₂=3*24+2*31+8*16=262
Mg-72u
262-----100%
72u-----x%
x=72*100/262
x=27,48
P-62
262----100%
63------x%
x=63*100/262
x=24,04
O-128
262-----100%
128----x%
x=128*100/262
x=48,85
Liczę na naj.