1) What is the hydroxide-ion concentration of a solution if its hydronium-ion co

Question

1) What is the hydroxide-ion concentration of a solution if its hydronium-ion concentration is (1.30x10^-5) mole per liter?

2) The amount of electric current that flows through a lamp that has resistance of 14.0 Ohms and is connected to a 10.5 Volt battery is ____ Amps

3) 42.0 grams F2 react according to the following balanced chemical equation F2+2Nal --> I2+ 2NaF. As a result of this reaction _____ grams of I2 are produced.

4) The force between two 7.11X10^-4 C charges that are 7.11 meters apart is ___ N

5) The pH of a solution with a hydroxide-ion concentration of 1.00x10^-13 mole per liter is ____.

6) Given the following reaction N2H4 --> 2H2+N2, how many moles of H2 will be produced if 3.30 moles of N2H4 react?

7) The following chemical equation is not balanced: A+R2 --> A2R3. After balancing, this chemical is ____________.

Explanation / Answer

1) hydroxide ion concentration = 1*10^-14/(1.3*10^-5) = 7.692*10^-10

2) i = V/R = 10.5/14 = 0.75 A

3) moles of F2 = 42/38

moles of I2 produced = 42/38

grans of I2 = (42/38)*127*2 = 280.736 g

4) F = kq1q2/r^2 = 8.98*10^9*7.11*10^-4*7.11*10^-4/7.11^2 = 89.8 N

5) pOH = -log(10^-13) = 13

pH = 14-13 = 1

6) 3.3*2 = 6.6 moles

7) 4A + 3R2 = 2(A2R3)

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