Question

For the reaction 2 AgNO, + Na, Cro, Ag, Cro, +2 NaNO, how many grams of silver chromate, Ag2CrO4, are produced from 13.1 g of silver nitrate, AgNO:?

Answer 1

Molar mass of AgNO3,

MM = 1*MM(Ag) + 1*MM(N) + 3*MM(O)

= 1*107.9 + 1*14.01 + 3*16.0

= 169.91 g/mol

mass of AgNO3 = 13.1 g

mol of AgNO3 = (mass)/(molar mass)

= 13.1/1.699*10^2

= 7.71*10^-2 mol

According to balanced equation

mol of Ag2CrO4 formed = (1/2)* moles of AgNO3

= (1/2)*7.71*10^-2

= 3.855*10^-2 mol

Molar mass of Ag2CrO4,

MM = 2*MM(Ag) + 1*MM(Cr) + 4*MM(O)

= 2*107.9 + 1*52.0 + 4*16.0

= 331.8 g/mol

mass of Ag2CrO4 = number of mol * molar mass

= 3.855*10^-2*3.318*10^2

= 12.79 g

Answer: 12.8 g