The compound Nd2(Goa, decomposes when heated according to the equation below. Nd

Question

The compound Nd2(Goa, decomposes when heated according to the equation below. Nd2(C204)3 (s) 2 Nd (s) + 6 CO2 (g) An impure sample of material contains a small amount of Nd (C,0), The sample is heated and the gas produced collected by downward displacement of water. A tota of 166.5 ml of gas is collected at a temperature of 22.0oC when the atmospheric pressure is 680.0 torn The vapor pressure of water at 22.00C is 19.83 torr.J Calculate the number of grams of Nd,(C20)s present in the impure sample. Grams of Nd, (C,o) grams Check Next page

Explanation / Answer

no of mol of CO2 PRODUCED = PV/RT

P = PRESSURE OF CO2 GAS = 680-19.83 = 660.17 torr

V = volume of gas = 0.1665 L

R = 0.0821 l.atm.k-1.mol-1

T = 22 c = 295.15 k

n = (660.17/760)*0.1665/(0.0821*295.15)

   = 0.006 mol

so that,

1 mol Nd2(C2O4)3 = 6 mol co2

no of mol of Nd2(C2O4)3 reacted = 0.006/6 = 0.001 mol

molar mass of Nd2(C2O4)3 = 552.54 g/mol

mass of Nd(C2O4)3 reacted = 0.001*552.54

                          = 0.5525 g

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