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2014-06-03T00:37:40+03:00
1 mol Ca ... 40 g
5 moli Ca ... x g
______________

x=40·g=200g

Masa moleculara P4=4·A P=4·30=120

1mol P4... 120g
4moli P4 ... y g
______________

y=120·4=480 g

masa amestec=x+y=200+480=680g