Chemistry/Math Questions?

Question

Can someone please help me with these questions? (The moles and grams go with whats on top of it) Thanks in advanced!

___8 Fe____+_____1 S8 (8 is subscript)_____=_____8 FeS
(1 mole= 55.8 g)______(1 mole= 256.5g)_______(1 mole= 87.9g)

1. How many moles of FeS can be made from 10.0 grams of Fe?

2. How many moles of FeS can be made from 100.0 grams of S8?

3. How many moles of FeS can be made from 10.0 grams of Fe AND 100.0 grams of S8?

4. How many grams of FeS can be made? (Convert your answer from #6 into grams of FeS):

Answer 1

Did you know FeS crystals are called "fools gold"?
For starters 8Fe + S8 -> 8 FeS. S8 is an alletropic form of sulfur, so it is distinguished from plain old sulfur, S. For the rest, you should MEMORIZE the routine:
grams to moles to moles to grams.
1. convert 10 g of Fe to moles of Fe (about 1/6)
The equation tells us that as many moles of FeS are produced as moles of Fe reacted. Thats your answer
2. same deal, convert 100g of S8 to moles (about 0.4). Equation tells us that 8 times as many moles of FeS are produced. Thats your answer
3. You can't make everybody happy, so Fe or S8 is going to limit production. From inspection, Fe limits, so the answer is the same as 1.
4. I assume this is a continuation. You know the moles of FeS from problem 1, so multiply it by mol weight to get grams.