Solution Stoichiometry To solve stoichiometry problems, you must always calculat

Question

Solution Stoichiometry To solve stoichiometry problems, you must always calculate numbers of moles. Recall that molarity, M, is equal to the concentration in moles per liter: M = mol/L. When solutions of silver nitrate and calcium chloride are mixed, silver chloride precipitates out of solution according to the equation 2AgNO_3(aq) + CaCl_2(aq) rightarrow 2AgCl(s) + Ca(NO_3)_2 (aq) What mass of silver chloride can be produced from 1.66 L of a 0.136 M solution of silver nitrate? Express your answer with the appropriate units. The reaction described in Part A required 3.20 L of calcium chloride. What is the concentration of this calcium chloride solution? Express your answer with the appropriate units.

Explanation / Answer

Part (A) number of moles of AgNO3 = 0.136 x 1.66 = 0.2258 mol

According to balanced equation, 2 mol AgNO3 can form 2 mol AgCl

Hence, 0.2258 mol of AgNO3 can form 0.2258 mol of AgCl

Therefore conc. of AgCl = 0.2258 / 1.66 = 0.136 mol/L

Part (B)

M1V1 / n1 = M2V2 / n2

0.136 x 1.66 / 2 = M2 x 3.20 / 1

M2 = 0.03528 M

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