What is a correct method for determining how many moles of calcium oxide are produced in the reaction of 10.0 g calcium with excess oxygen?
2 Ca(s) + O2(g) ® 2 CaO(s)
10 g Ca x [1 mol/40.07 g] x 56.07 g/mol
10 g Ca x [2 mole CaO/ 2mole Ca] x [56.07 g/mol]
10 g Ca x 40.07 g/mol x [56.07 g/mol]
10 g Ca x [2 mole Ca / 2 mole CaO] x 40.07 g/mol
40.07 g/mol x 10 g/mol x [2 mole CaO/2 mole Ca]
Question 15.15. If 0.250 moles of bromine and 0.600 moles of ammonia react according to the equation below, What is the maximum amount of ammonium bromide (in moles) produced?
3 Br2(l) + 8 NH3(g) ® 6 NH4Br(s) + N2(g)
Question 16.16. Polyethylene is a polymer consisting of only carbon and hydrogen. If 3.000 g of the polymer is burned in oxygen it produces 3.855 g H2O and 9.414 g CO2. What is the empirical formula for polyethylene?(Points : 5)
Question 17.17. Sodium carbonate reacts with hydrochloric acid as shown below in anunbalancedchemical equation. What mass of CO2is produced from the reaction of 2.94 g Na2CO3with excess HCl?
Na2CO3(s) + HCl(aq)®NaCl(aq) + CO2(g) + H2O(l)
(Points : 5)
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