Pre Exam 3 Homework (1).docx - Pre Exam 3 Homework 1 In this reaction what is the coefficient for calcium oxide CaO(s CO2(g \u2192 CaCO3(s A 1 B 2 C 3 D 4

Pre Exam 3 Homework (1).docx - Pre Exam 3 Homework 1 In...

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Pre Exam 3 Homework 1) In this reaction, what is the coefficient for calcium oxide?CaO(s) + CO2(g) CaCO3(s)A) 1B) 2C) 3D) 4E) 52) In the following reaction, when the equation is correctly balanced, what is the correct coefficient for H2?Fe(s) + HCl(aq) FeCl3(aq) + H2(g)3) What is the classification for this reaction?SO3 (g) + H2O (l) H2SO4 (l)
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4) How many molecules of water, H2O, are present in 75.0 g of H2O?5) One mole of particles of any substance contains how many particles?A) 106B) 3 × 10-10C) 3 × 1010D) 6.02 × 1023E) 6.02 × 10-236) How many moles of water, H2O, are present in 75.0 g of H2O?7) Calculate the molar mass of magnesium chloride, MgCl2.
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8) What is the molar mass of Mg3(PO4)2, a substance formerly used in medicine as an antacid?2Mg + O22MgO9) The number of moles of oxygen gas needed to react with 4.0 moles of Mg isA) 1.0 mole.B) 2.0 moles.C) 3.0 moles.D) 4.0 moles.E) 6.0 moles.10) In an endothermic reaction,
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11) The __________ is the energy difference between reactants and products in a chemical reaction.12) The __________ is the minimum energy needed for a chemical reaction to begin.
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