Chemistry Equations Please Help Im Lost!?

C

Chris

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White phosphorus, P4, is prepared by fusing calcium phosphate, Ca3(PO4)2, with carbon, C, and sand, SiO2, in an electric furnace.
2 Ca3(PO4)2(s) + 6 SiO2(s) + 10 C(s) → P4(g) + 6 CaSiO3(l) + 10 CO(g)
How many grams of calcium phosphate are required to give 14.5 g of phosphorus?


Copper metal reacts with nitric acid. Assume that the reaction is as given below.
3 Cu(s) + 8 HNO3(aq) → 3 Cu(NO3)2(aq) + 2 NO(g) + 4 H2O(l)
If 4.41 g Cu(NO3)2 is eventually obtained, how many grams of nitrogen monoxide, NO, would have formed also, according to the preceding equation?
 
hints...

Q1...
1) convert mass P4 to moles P4
2) convert moles P4 to moles Ca3(PO4)2 via the coefficients of the balanced equation.. 2:1
3) convert moles Ca3(PO4)2 to mass Ca3(PO4)2

Q2...same basic idea...
1) convert mass Cu(NO3)2 to moles Cu(NO3)2
2) convert moles Cu(NO3)2 to moles NO via the coefficients of the balanced equation... 2:3
3) convert moles NO to mass NO
 
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