Edexcel Jun 2017 (IAL) Paper 1 Q1

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SECTION A Answer ALL the questions in this section. You should aim to spend no more than 20 minutes on . and then mark your new answer with this section. For each question, select one answer from A to D and put a cross in the box If you change your mind, put a line through the box . a cross 1 Sea water contains 2.7 mg of sulfate ions per kilogram. What is the concentration of sulfate ions in parts per million by mass? D O N O T W R I T E I N T H I S A R E A A 2.7106 B 2.7103 C 2.7 D 2.7103 2 How many ions are in 284 g of sodium sulfate, Na2SO4? Avogadro constant = 6.01023 mol1 Molar mass of sodium sulfate = 142 g mol1 A 1.21024 B 2.41024 C 3.61024 D 8.41024 (Total for Question 1 = 1 mark) D O N O T W R I T E I N T H I S A R E A (Total for Question 2 = 1 mark) 3 Calculate the empirical formula of the compound with the percentage composition by mass: Li = 17.9%; P = 26.8%; O = 55.3% Molar masses / g mol1 Li = 6.9, P = 31.0, O = 16.0 A Li2P3O6 B Li3PO3 C LiPO3 D Li3PO4 (Total for Question 3 = 1 mark) *P48382A0224* 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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