When 15 g of valeric acid is reacted with an excess of calcium carbonate, the salt is obtained. Calculate its mass.

Let’s execute the solution:
m = 15 g. X g. -?
1. 2С4Н9СООН + CaCO3 = (C4H9COO) 2Ca + H2CO3 – exchange, the calcium salt of valeric acid was obtained;
2. Calculations by formulas:
M (C5H10O2) = 102 g / mol.
M (salt) = 242.08 g / mol.
3. Determine Y (mol) of valeric acid:
Y (C5H10O2) = m / M = 15/102 = 0.15 mol.
Y (salt) = 0.15 mol since the amount of substances is 1 mol according to the equation.
4. Find the mass of the product:
m (salt) = Y * M = 0.15 * 242.08 = 30.3 g.
Answer: an organic salt with a mass of 30.3 g was obtained.