1 - many home barbeques are fueled with propane gas (C3H8). What mass of carbon

Question

                    1 - many home barbeques are fueled with propane gas (C3H8). What mass of carbon dioxide (in kg) is produced upon the complete combustion of a typical tank of propane containi 18.9 L. The density of the propane is 0.621                     g/ mL Hint: begin by writing a balanced rquation for the combustion reaction.
                

                    2- When SiO2 is heated to melting, it reacts with solid carbon to form liquid silicon and carbon monoxide gas. in an industrial preparation of silicon, 155.8                     Kg of SiO2 reacts with 78.3 Kg of carbon to produce 66.1 Kg of silicon. Determine the limiting reactant yield, and percent yield for the reaction.
                

                                     Thanks

Explanation / Answer

1-C3H8 + 5O2 ----> 4H2O + 3CO2

18.9 L * 621g/L * 1m/44.11g * 3m/1m * .04401kg/m =

35.13kg CO2

2-balance reaction is always the first step

SiO2(s)+C(s)->Si(l)+CO2(g)
to get the limiting reactant convert the masses to moles and divide by the coefficients, the lower number is the limiting reactant
to get the theoretical yield take the moles of limiting reactant and use the mole to mole ratio of reactant to product (Si) to get moles of Si, convert this to grams to get the theoretical yield
to get percent yield take actual yield (given here, 66.1kg) and divide by theoretical yield, then turn it to percent by multiplying by 100 and adding % at the end

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