Question

# 1)98.3 J of heat is supplied to 12.28 g of a substance, and its temperature rises by 5.42 ∘

C. What is the specific heat of the substance?

_________________ J/g∘C (round answer to 3 significant figures)

2)

What is an equilibrium constant and what is the general equation for determining the equilibrium constant of a reaction?

3) At equilibrium at 2500 K, the concentration of HCl=0.0625 M and the concentrations of H 2

and C l 2

= 0.00450 M for the reaction:

H 2 ( g ) + C l 2 ( g ) → 2 H C l ( g )

What is the equilibrium constant for the reaction? _____ round to 3 significant figures

4)

Consider the following reaction:

H 2 S ( a q ) → H + ( a q ) + H S − ( a q )

K e q = 9.5 x 10 − 8

In a certain equilibrium mixture at 25∘C, the concentration of H +

is equal to the concentration of H S − and is equal to 2.7x10-4 M. Determine the concentration of H 2 S in this mixture.

________________ M (round answer to 3 significant figures)

5)

Given the following equilibrium equation:

N 2 ( g ) + 2 O 2 ( g ) + 66.2 k J → 2 N 2 ( g )

Predict the direction of equilibrium that will be favored (forward, reverse or neither) for each of the following changes:

O 2 removed _______________________

The temperature is increased _____________________

The pressure is increased _______________________

A catalyst is used ________________________

N O 2 is removed ____________________________

The temperature is decreased ______________________

The system volume is increased ________________________

6)

What is the concentration of H +ions in a solution of 0.359 mol/L H 2 S O 4?

_____________ mol H+ (round answer to 2 significant figures)

7)

A solution has a pH of 6.54. What is the concentration of hydronium ions in the solution? ________________ (round answer to 3 significant figures)

8)

A solution contains 4.33 x 10 − 8 M hydroxide ions. What is the pH of the solution?

________________ (round answer to 3 significant figures)

9)An unknown solution was found in the lab. The pH of the solution was tested and found to be 3.98. What is the concentration of hydroxide ions in this solution? ____________________ (round answer to 3 significant figures)

10)

What is the pOH of a solution that has a hydronium concentration of 3.2x10-6?

_________________ (round answer to 2 significant figures)

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Subject: Chemistry, Science
1) 98.3 J of heat is supplied to 12.28 g of a substance, and its temperature rises by 5.42 C. What is the specific heat of the substance? 204,222 students got unstuck by Course
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