* 63%- 1:42 PM instructure-uploads,s3.amazonaws.com 5 of 5 lultiple Choice Revie
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* 63%- 1:42 PM instructure-uploads,s3.amazonaws.com 5 of 5 lultiple Choice Review Problems How many moles of silver are contained in 1.00 kg of silver? a) 9.27x103 d) 9.27x10 b) 9.27x101 e)9.27x10 e) 9.27 2. How many moles of KOH are in 27.5 mL of 0.250 M KOH? a) 0.00431 d) 0.00813 b) 0.00688 e) 0.00921 c) 0.00724 3, How many moles of silver are contained in .00 kg of silver? b)9.27x10c9.27 d) 9.27x10 a) 9.27x103 e) 9.27x10 4. A 34.0-g sample of NaOH is dissolved in water, and the solution is diluted to give a final volume of 2.00 L. The molarity of the final solution is a) 0.425 M b) 0.588 M.c) 0.850 M d) 17.0 M e) 00588 M 5. What volume of 0.733 M NaCO, (106 g/mol) solution contains 94.5 g of Na,CO,? a) 0.822 L b) 0.653 L c) 7.34 x 103 L d) 1.37 × 104 L e) 1.22 L 6. A flask with a volume of 3.16 L contains 9.33 grams of an unknown gas at 32.0°C and 1.00 atm. What is the molar mass of the gas? A) 7.76 g/mol B) 66.1 g/mol C) 74.0 g/mol D) 81.4 g/mol E) 144 g/mol 7. Dr. I. M. A. Brightguy adds 0.1727 g of an unknown gas to a 125-mL flask. If Dr. B finds the pressure to be 736 torr at 20.0°C, is the gas likely to be methane, CHs, nitrogen, N2, oxygen, O2, neon, Ne, or argon, Ar? A) CH4 B) N2 C) Ne D) Ar E) 02 Free Response Review Problems I. A compound is composed of only C and H. It contains 88.82% C by mass and has a molar mass of 54.09 g/mol. What is its molecular formula? 2. What mass of H3PO4 (98 g/mol) is present in 93.5 L of a 0.0604 M solution of H3PO4? 3. Calculate the molarity of a solution that contains 16.1 g of NaOH (40.0 g/mol) in 200.0 mL of solution. 4. What volume of 0.10 M sodium bromide, NaBr, contains 3.3 × 10-4 mol of bromide ions? 5. A sample containing only carbon, hydrogen, phosphorus, and oxygen is subjected to elemental analysis After complete combustion, a 0.3408-g sample of the compound yields 0.4887 g of CO2, 0.300 g of H20 and 0.2627 g of P410-What is the empirical formula of the compound? 6. A hydrocarbon, subjected to elemental analysis, was found to contain 90.51% carbon and 9.49% hydrogen by mass. What is the empirical formula of the hydrocarbon? 7. The empirical formula for a group of compounds is CHCI. Lindane, a powerful insecticide, is a member of this group. The molar mass of lindane is 290.8. How many atoms of carbon does a molecule of lindane contain? 8. Maleic acid contains 41.4% carbon, 3.47% hydrogen, and 55.1% oxygen by mass. A 0.050-mol sample of this compound weighs 5.80 g. What is the molecular formula of maleic acid? 11 9. Draw Lewis Structures for each of the followingExplanation / Answer
1)
Molar mass of Ag = 107.9 g/mol
mass(Ag)= 1.00 Kg = = 1000 g
number of mol of Ag,
n = mass of Ag/molar mass of Ag
=(1000 g)/(107.9 g/mol)
= 9.27 mol
Answer: c
2)
number of mol = Molarity * volume
= 0.250 M * 27.5 mL
= 6.88 mmol
= 0.00688 mol
Answer: b
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