anonymous
  • anonymous
Consider the following unbalanced reaction: C(s) + S8(s) → CS2(l) How many grams of carbon disulfide will be produced if 8.80 g of C and 17.2 g of S8 are allowed to react completely? Report your answer to 3 significant figures and do not include units.
Chemistry
katieb
  • katieb
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aaronq
  • aaronq
do you know what units you use in stoichiometric problems?
anonymous
  • anonymous
in this case g CS2
anonymous
  • anonymous
MOLEES?

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aaronq
  • aaronq
nope you ALWAYS use moles
anonymous
  • anonymous
OK
aaronq
  • aaronq
so to solve this problem: (1) balance the reaction (2) convert grams of reactants to moles of reactants ...moles=mass/molar mass (3) determine limiting reactant (whichever one you have less of will determine how much product you can make) (4) use the coefficients from the balanced equation to find how many moles of product you make (5) convert to grams ...again using n=m/M
aaronq
  • aaronq
do these and ill help you if you get stuck
anonymous
  • anonymous
im stuck...im trying to convert the grams of the reactant to moles of reactant but im confused
aaronq
  • aaronq
okay, so you know how many grams you have .. do you know each reactants molar mass?
anonymous
  • anonymous
molar mass of C=12.011?
anonymous
  • anonymous
Molar mass of CS2=76.141
aaronq
  • aaronq
okay so use the formula n=m/M moles = mass / molar mass find the number of moles ie. divide the mass by the molar mass
aaronq
  • aaronq
so for carbon m=(8.8g)/(12g/mol) = 0.733 mol
anonymous
  • anonymous
OK
Preetha
  • Preetha
Aaron, really good work helping this learner!

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