Question

11-20

Роки с A hydrocarbon is 80.00 carbon and 20.00 broen by mass. Its empirical formalis a) CH b) c) CH ( O H ) CH. 12. Two moles of Br contain how many moles of com? a b) c) 05 d) 160 c) 320 Zmus 13. If the formula for lithium nitrate is LINO, then based on your knowledge of the periodic table, which of the following would be a correct formula for other nitrate Commundet NO 3 a) NaNO; b) Ca(NO), e) Ga(NO) d)a&b a bande 1 - 2 - 3 -3 14. When the following equation C510 , CO, +11, is balanced with the smallest whole number cecflicients, there will be a 2 in front of Cl. b) 4 in front of CO, c) 8 in front of d) 3 in front of H.O e) 5 in front of Oz Du 15. Consider the balanced equation: 25 (s) + 30,( → 250, () 164g of salfur are reacted with excess oxygen, then which of the following will be true? The amount of SO, that forms will be SOI b) 40.0 c) 1602d ) 22. 4 c ) 32.1 g 16. 200 ml of a 15.0% v/v alcohol in water solution would contain how many ml. of alcohol? a) 15.0 ml. b) 150 ml 0.0.0 ml. d) 200 ml. c) 13.3 ml. 17. 200.0 mL of a sodium chloride in water solution contains $8.5 g of NaCl, What is its molarity! a) 1.00 M b) 5.00 M c) 58.5 M ( 3.42 M 0.293 M a 18.250.0 mL of a 10.0% m/v solution of Na PO, are mixed with 500 ml. of water. (Assume the final volume is 300.0 mL. The m/v % is now a) 8.33% 6) 3.00% c) 5.00% d) 12.0% e) still 10.0% since no sodium phosphate was added 79) 52.0 g of sucrose (CH:01. molar mass - 342 g/mol) are mixed with 48.0 g of water. The density of this solution is 1.24 g/ml. Which of the following is true? The moles of sucrose in the solution is 0.152 by The volume of the solution is 80.6 ml The m/m % of the sucrose solution is 52.0% d) The molarity of the solution is 1.89 M c) all of the above 400. g of a 6.00% m/m glucose in water solution sits in a beaker. Exactly half of the solution is poured down the drain. What is true about the solution that remains in the beaker? a) It contains half the original mass of glucose. b) It contains half the original number of molecules of glucose. c) It is now a 3.00% m/m solution of glucose in water. d) a and b eya, b, and

Answer 1

11) The moles are calculated:

n C = 80/12 = 6.7

n H = 20/1 = 20

You have the ratio:

n H / n C = 20 / 6.7 = 3

CH3 formula.

12) Two moles of Br2 contains Four moles of atoms of Br.

13) Option e. All are correct.

14) The balanced reaction is:

C3H8 + 5 O2 = 3 CO2 + 4 H2O

Option e.

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