posted by katie .
Use the equation below to answer the following questions.
Al + H2SO4 ==> Al2(SO4)3 + H2
A. If 8.15 moles of aluminum are reacted, how many moles of hydrogen will be produced?
B. If 44.7 g of hydrogen sulfate is reacted, what mass of aluminum sulfate is produced?
C. If 34.6 g of hydrogen sulfate is reacted, how many moles of aluminum is also reacted?
D. What mass of aluminum is needed to produce 0.321 moles of hydrogen?
You need to balance the equation.
2Al + 3H2SO4 ==> Al2(SO4)3 + 3H2
Now use the coefficients to convert mols Al to mols H2.
mols H2 = mols Al x (3 mols H2/2 mols Al) = ??
Note how the mols Al cancel to leave mols H2. That is how you know if the conversion factor you are using is the right one (instead of using 2 mols Al/3 mols H2.