3. How many moles of silver are contained in 1.00 kg of silver? a) 9.27x103 9.27

Question

3. How many moles of silver are contained in 1.00 kg of silver? a) 9.27x103 9.27x101 c) 9.27 d) 9.27x10 e) 9.27x103 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) 0.0588 M. 5. What volume of 0.733 M Na2CO3 (106 g/mol) solution contains 94.5 g of Na2CO3? a) 0.822 L b) 0.653 L c) 7.34 x 103 L d) 1 .37 x 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, CH4, 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 HjPO4 (98 g/mol) is present in 93.5 L of a 0.0604 M solution of HjPO4? 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?

Explanation / Answer

3)

Molar mass of Ag = 107.9 g/mol

mass of Ag = 1.00 Kg

= 1000.0 g [using conversion 1 Kg = 1000 g]

we have below equation to be used:

number of mol of Ag,

n = mass of Ag/molar mass of Ag

=(1000.0 g)/(107.9 g/mol)

= 9.27 mol

Answer: c

Feel free to comment below if you have any doubts or if this answer do not work

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