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)
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.
8) What is the molar mass of Mg3(PO4)2, a substance formerly used in medicine as an antacid?2Mg + O2→ 2MgO9) 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,
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.
- Fall '10