Challenge Stoichiometry

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Presentation transcript:

Challenge Stoichiometry Lesson 7

A 10.0 g sample of a Cu/Ag alloy reacted with concentrated HNO3 according to the following equations. A total of 8.986 g of NO2 was isolated. Assuming a 100 % yield of NO2, determine the mass of Cu and Ag in the alloy. Cu(s) + 4HNO3(aq) → Cu(NO3)2(aq) + 2NO2(g) + 2H2O(l) Ω g ?g 2Ag(s) + 4HNO3(aq) → 2AgNO3(aq) + 2NO2(g) + 2H2O(l) (10 - Ω) g ?g 10.0 g 8.986 g

A 10.0 g sample of a Cu/Ag alloy reacted with concentrated HNO3 according to the following equations. A total of 8.986 g of NO2 was isolated. Assuming a 100 % yield of NO2, determine the mass of Cu and Ag in the alloy. Cu(s) + 4HNO3(aq) → Cu(NO3)2(aq) + 2NO2(g) + 2H2O(l) 2Ag(s) + 4HNO3(aq) → 2AgNO3(aq) + 2NO2(g) + 2H2O(l) Ω g Cu x 1 mole x 2 mole NO2 x 46.0 g = 1.4488 Ω 63.5 g 1 mole Cu 1 mole 10 – Ω g Ag x 1 mole x 2 mole NO2 x 46.0 g = 4.2632 - 0.42632 Ω 107.9 g 2 mole Ag 1 mole 1.4488 Ω + 4.2632 - 0.42632 Ω = 8.986 1.0225 Ω = 4.7228 Note the loss of a sig fig! Ω = 4.62 g Cu 10.0 - 4.62 = 5.4 g Ag

A 10.00 g sample of brass, a Cu/Zn alloy, is completely reacted with concentrated HNO3 according to the following equations. A total of 14.2356 g of NO2 was isolated. Assuming a 100 % yield of NO2, determine the mass of Cu and Zn in the alloy. Cu(s) + 4HNO3(aq) → Cu(NO3)2(aq) + 2NO2(g) + 2H2O(l) Ω g ?g Zn(s) + 4HNO3(aq) → Zn(NO3)2(aq) + 2NO2(g) + 2H2O(l) (10 - Ω) g ?g 10.0 g 14.2356 g

A 10.00 g sample of brass, a Cu/Zn alloy, is completely reacted with concentrated HNO3 according to the following equations. A total of 14.2356 g of NO2 was isolated. Assuming a 100 % yield of NO2, determine the mass of Cu and Zn in the alloy. Cu(s) + 4HNO3(aq) → Cu(NO3)2(aq) + 2NO2(g) + 2H2O(l) Zn(s) + 4HNO3(aq) → Zn(NO3)2(aq) + 2NO2(g) + 2H2O(l) Ω g Cu x 1 mole x 2 mole NO2 x 46.0 g = 1.4488 Ω 63.5 g 1 mole Cu 1 mole 10 – Ω g Zn x 1 mole x 2 mole NO2 x 46.0 g = 14.0673 - 1.40673 Ω 65.4 g 1 mole Zn 1 mole 1.4488 Ω + 14.0673 - 1.40673 Ω = 14.2356 0.04207 Ω = 0.1683 Ω = 4.00 g Cu 10.00 – 4.00 = 6.00 g Zn