If all of the chloride in a 5.000-g sample of an unknown metal chloride is precipitated as agcl with 70.90 ml of 0.2010 m agno3, what is the percentage of chloride in the sample?

a. 50.55%

b. 10.10%

c. 1.425%

d. 20.22%

e. None of the above

The percentage of chloride in the sample is 10.11% (answer B)

calculation and explanation

step 1: find the moles of AgNo3

moles = molarity x volume in liters

volume in liters = 70.90/100=0.709 L

moles=0.2010 x0.709=0.01425 moles which is also moles of cl-

step 2:find the actual mass of Cl-

mass = moles x molar mass

= 0.01425 moles x 35.5 g/mol = 0.5059 grams

step 3: find the % mass

actual mass/theoretical mass x 100

0.5059 g/5.000 g x100 = 10.11%