The combustion of 10.0 g of lactic acid (C_3H_60_3) produces 14.7 g CO_2 and 6.0
ID: 942641 • Letter: T
Question
The combustion of 10.0 g of lactic acid (C_3H_60_3) produces 14.7 g CO_2 and 6.00 g H_2O. How is it possibl for the combined masses of CO_2 and H_2O to be greater than the mass of C_3H_6O_3? CO_2 is a gas, so it doesn't contribute any mass to the products. Combustion violates the law of conservation of mass. CO_2 and H_2O have greater molar masses than the compound that is burned. Oxygen consumed in the combustion contributes to the mass of the products. Which of the following quantities contains the largest number of atoms ofthat element? Which of the following solutes would be insoluble in water?Explanation / Answer
Q10) The correct answer is Option D, Oxygen consumed in the combustion contributes to the mass of products
Since the reaction will be
C3H6O3 + 3O2 -------- 3CO2 + 3H2O
Q11) Molar mass of Hydrogen gas = 2 gm/mol
Molar mass of Carbon = 12 gm/mol
Molar mass of Silicon = 28 gm/mol
Since mass is same, hence the number of atoms is invesely proporitional to the mass, hence the correct answer is Option A
12)
The correct answer will be Option C