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8. How many gram Na in 5.00g Na2SO4? A. 0.035 g                   B. 1.31 g               

8. How many gram Na in 5.00g Na2SO4?

A. 0.035 g                   B. 1.31 g                     C. 1.62 g                     D. 0.97 g                     E. 0.81 g

9. A compound containing only carbon and hydrogen has   85.7 wt% C and    14.3 wt%H. Its molar mass is 56 amu. What is its molecular formula?

A. C4H8                       B. C2H4                       C. C2H                               D. CH2                                    E. CH

10. Balance the following reactions. No fractional coefficients, coefficients must be the lowest whole numbers.

a)         ____K   +   ____H2O     →   ____KOH +   ____H2    

b)         ____H2O2      →   ____H2O + ____O2

c)         ____C2H6   +   ___ O2   →   ____CO2   + ____H2O

d)         ____KOH   + ____H3PO4 →    ____K3PO4   +   ____H2O

e)         ____C2H5OH + ____O2 → ____CO2 + ____H2O

11. How many g of CO2 are formed from the combustion of 2.9 g of butane, C4H10 with excess oxygen? The balanced reaction is:   2C4H10 +   10O2 → 8CO2 + 10H2O

A. 0.26g                      B. 6.6g                        C. 8.8g                        D. 10.5g                      E. 2.2g

12. How many g I2 will react with 20.4 g Al to form AlI3 (aluminum iodide)? As always, first balance the reaction! (Hint: this is not a limiting reagent problem)

A. 144. g                     B. 288. G                    C. 192. G                    D. 72 g                        E. 576 g          

13. For the balanced reaction: N2(g) + 3H2(g) → 2NH3(g). How many moles of NH3 will be produced when 0.50 mol N2 reacts with 1.0 mol H2?     

A. 0.67 mol                B. 1.0 mol                   C. 0.50 mol                 D. 2.0 mol                   E. 3.0 mol

14. Calculate the mass of CO2 formed when 2.3 g of ethanol, C2H5OH reacts with 3.2 g oxygen O2 to form CO2 and H2O. (You balanced the reaction in 8.e)! This is a limiting reagent problem!

A. 4.6g                       B. 2.2g                        C. 4.4g                        D. 6.6g                                    E. 2.93g

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