Concept explainers
(a)
Interpretation:
The mass of CO2 produced upon combustion of 200 g mixture of 25.0 % CH4 and 75.0 % C3H8 is to be calculated.
Concept introduction:
A balanced chemical equation obeys the law of conservation of mass since the total mass of reactants and products are equal in a balanced chemical equation.
The number of moles is calculated by the formula:
Number of moles=given mass of sample(g)molar mass (g/mol) (1)
The formula to calculate mass is as follows:
Mass of a given sample(g)=(molar mass g/mol)(number of moles) (2)
(b)
Interpretation:
The mass % of CH4 in 252 g of gaseous mixture that contains CH4 and C3H8 yields 748 g of CO2 is to be determined.
Concept introduction:
Mass percent is defined as the mass of a component divided by the total mass of the mixture, multiplied by 100.
The formula to calculate mass % is as follows:
Mass %=given mass(g)total mass of mixture(g)(100 %) (5)
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Chemistry: The Molecular Nature of Matter and Change
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