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mCu=64u
a)
160g soli ---- 64g miedzi
3,2g soli ----- xg miedzi
x = 1,28g miedzi
b)
160g soli ---- 4*6,02*10²³ at. tlenu
3,2g soli ---- x at. tlenu
x = 48,16*10²¹ at. tlenu
c)
160g soli --- 1mol at. siarki
3,2g soli ----- x moli at. siarki
x = 0,02mola at. siarki