[رهف الاحساس]

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(24) Which statement is false for the balanced equation given below?
(Atomic weights: N = 14.01, H = 1.008).

N2 + 3 H2 2 NH3

(a) One molecule of nitrogen requires three molecules of hydrogen
(b) The reaction of 14 g of nitrogen produces 34 g of NH3*
(c) The reaction of 3 moles of hydrogen will produce 34 g of NH3
(d) One mole of N2 will produce two moles of NH3



(25) What is the limiting reagent in the process , 3.00 g of calcium are treated with 2.00 g of fluorine to prepare CaF2 , and how much excess reagent (in moles) is left at the end of the reaction 7?
(Atomic weights: Ca = 40.08, F = 19.00).

Ca + F2 CaF2

(a) Ca, 0.075
(b) Ca, 0.022
(c) F2, 0.022*
(d) F2, 0.053

(26) Reaction of 1.00 mole CH4 with excess Cl2 yields 96.8 g CCl4. What is the percent yield of CCl4 ?
(Atomic weights: C = 12.01, Cl = 35.45).

CH4 + 4 Cl2 CCl4 + 4 HCl

(a) 64.3
(b) 57.3
(c) 65.9
(d) 62.9*



(28) Fluoxymesterone, C20H29FO3, is an anabolic steroid. A solution is prepared by dissolving 0.01 g of the steroid in 500.0 mL of water. If this solution is diluted to a final volume of 1.00 L. What is the resulting molarity?
(Atomic weights: C = 12.01, O = 16.00, F = 19.00, H = 1.008).
(a) 5.94 x 10-11
(b) 2.38 x 10-11
(c) 5.94 x 10-8
(d) 1.488 x 19-5*

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