Edexcel Jun 2017 Paper 1 Q9

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9 When gold(III) oxide is heated, it decomposes to form gold and oxygen. Calculate the mass of gold formed when 2.21g of gold(III) oxide is heated to constant mass. [Molar masses: O = 16.0 g mol1 Au = 197 g mol1] A 1.97 g B 2.04 g C 2.10 g D 2.15 g (Total for Question 9 = 1 mark) D O N O T W R I T E I N T H I S A R E A 10 One of the reactions in the catalytic converter of a car exhaust is 2NO(g) + 2CO(g) (cid:111) 2CO2(g) + N2(g) 400 cm3 of NO is mixed with 500 cm3 of CO. What is the total volume of gas when the reaction is complete? All gas volumes are measured at the same temperature and pressure. A 600 cm 3 B 700 cm 3 C 1300 cm 3 D The volume cannot be calculated without the molar volume of gas at the appropriate temperature and pressure. (Total for Question 10 = 1 mark) Use this space for rough working. Anything you write in this space will gain no credit. *P53491A0632* D O N O T W R I T E I N T H I S A R E A D O N O T W R I T E I N T H I S A R E A<br />

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