Reactions

Question 1 of 10 What is the correct value for Avogadro's number? A. 6.022 × 102.3 B. 6.022 × 1033 C. 6.023 × 1022 D. 6.022 × 1023 E. none of the above

Question 2 of 10 What is the mass of 1.56 × 1021 atoms of magnesium in grams? A. 4.72 × 10-5 B. 0.0630 C. 1.07 × 10-4 D. 0.142 E. none of the above

Question 3 of 10 Calculate the molar mass of ammonium carbonate. A. 88.05 g/mol B. 96.09 g/mol C. 78.05 g/mol D. 112.09 g/mol E. none of the above

Question 4 of 10 What are the coefficients for the following reaction when it is properly balanced?___HCl + ___Mg → ___MgCl2 + ___ H2 A. 2, 1, 2, 2 B. 2, 1, 1, 1 C. 1, 2, 1/2, 1 D. 1, 1, 1, 2 E. none of the above

Question 5 of 10 What type of reaction is the generic equation A + BC → AC + B? A. synthesis/combination B. double-displacement C. decomposition D. single displacement E. none of the above

Question 6 of 10 A precipitate is expected to be formed when an aqueous solution of sodium sulfate is added to an aqueous solution of A. iron(III) chloride. B. magnesium chloride. C. barium chloride. D. potassium chloride. E. none of the above

Question 7 of 10 How many moles of sodium metal are needed to make 3.6 moles of sodium chloride? Given the reaction: 2Na + Cl2 → 2NaCl A. 3.6 B. 7.2 C. 1.8 D. 0.9 E. not enough information

Question 8 of 10 What is the limiting reactant for the reaction below given that you start with 10.0 grams of Al and 19.0 grams of O2? Reaction: 4Al + 3O2 → 2Al2O3 A. Al B. Al2O3 C. O2 D. both Al and O2 E. not enough information

Question 9 of 10 The theoretical yield of a reaction is 75.0 grams of product and the actual yield is 42.0g. What is the percent yield? A. 75.0 B. 178 C. 56.0 D. 31.5 E. none of the above

Question 10 of 10 A chemist wishes to perform the following reaction: N2 + 3 H2 → 2 NH3 If only 14.0 g of N2 is available, what is the minimum amount, in grams, of H2needed to completely react with this quantity of N2? A. 3.03 g B. 1.01 g C. 1.51 g D. 6.06 g E. none of the above