How to Solve Limiting Reactants

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Kensharra D 3J
Posts: 7
Joined: Fri Sep 28, 2018 12:26 am

How to Solve Limiting Reactants

Postby Kensharra D 3J » Thu Oct 04, 2018 3:24 pm

Can anyone help me how to understand how to solve these sort of problems that ask one to find moles?
"How many moles of Co2 are produced when 1kg of CaCo3 is used to neutralize an acid spill? The equation for the reaction at 1atm and 25 degrees C is :
CaCo3(s) +H(2) So4 (aq)---> CaSo4 (s) + Co2 + H2O (l) "
Am I suppose to convert kg to g? and do I ignore the 1atm and 25 degrees C?

Camille Marangi 2E
Posts: 60
Joined: Fri Sep 28, 2018 12:26 am

Re: How to Solve Limiting Reactants

Postby Camille Marangi 2E » Thu Oct 04, 2018 4:02 pm

The 1 atm and 25 degrees C is given information to ensure that the reaction is done at STP (standard temperature and pressure) to show that the gases in this reaction act ideally and guarantee that all calculations/measurements are consistent- basically no further action is necessary when this info is given

As for the actual problem you convert the 1 kg of CaCO3 to grams and then use molar mass to convert that figure to moles

1kg CaCO3*1000= 1000g --> 1000g CaCO3/(100.08g/mol)= 10 mol CaCO3

From here you do a mole to mole conversion to convert calcium carbonate to carbon dioxide, which doesn't change the value since the equation shows a 1:1 mole ratio

10mol CaCO3*(1 mol CO2/1 mol CaCO3)=10 mol CO2

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