help with some chemisrty problems?

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by anne109 at September 30, 2010

1) find the molecular formula of .66 moles of a substance with a mass of 99g.

2)how many moles of PH3 are there for every 4 moles of

H3H2 + P2 ------> 2PH3

3) FeS formed from 9.42g of Fe reacts with 8.5 S. what is the mass?

Fe + S -----> FeS

4)how many grams of silver nitrate does it take to react completely with 7mol

CuCu + 2AgNo3 -----> Cu(NO3)2 + 2Ag

5) what mass of Ag2 is produced from a mixture of 2g Ag and Ag S86)percent yield? 28.2 g PI2 is obtained from 48.0g I2 excess phosphorus what is the percent yield?

2P +3I2 ----> 2PI3