Aisling )·CH 13101-F17 Quizzes & Homework > Homework # 8: Due Dec. 3rd 11:59pm s

Question

Aisling )·CH 13101-F17 Quizzes & Homework > Homework # 8: Due Dec. 3rd 11:59pm ster 2017 General Chemistry I (Fall 2017) Question 9 The compound Nd,(C,O) decomposes when heated according to the equation below Tries remaining: Nd2(C204)3 (s) Nd203 (s) + 3 co, (g) + 3 CO (g) An sample of material contains a small amount of Nd2(C204)3 The sample is heated and the gases 3.00 produced are collected by downward displacement of water. A total of 112.6 ml of gas is collected at a [The vapor pressure of water at 22.00C is 19.83 torr. Calculate the total (combined) pressure of CO and CO2 in the collection mixture in atmospheres of 22.0°C when the atmospheric pressure is 730.0 torr Atm How many moles of CO gas were collected? [Hint: Think about the ratio of the number of moles of Co to the total number of moles of all gases collected. Moles of Co moles Calculate the number of grams of Nd2(C20)3 (m.w.-552.5 g/mol) present in the impure sample. Grams of Nd2(C204)3 grams Finish attempt Previous page

Explanation / Answer

pressure of the gas mixture = 730-19.83 = 710.17 torr

no of mol of mixture collected (n) = PV/RT

                                    = (((730-19.83)/760)*0.1126)/(0.0821*295.15)

               = 0.00434 mol

   from equation : 3 mol CO2 = 3 mol CO = 1 mol Nd2(c2o4)3

so that, both CO,CO2 are equal ratio.

no of mol of CO = 0.00434/2 = 0.00217 mol

no of mol of Nd2(c2o4)3 present in sample = 0.00217/3 = 0.000723 mol

mass of Nd2(c2o4)3 present in sample = 0.000723*552.5 = 0.4 grams

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