Question 15 What is the molarity of 6.00 g KBr in 1.50 L of solution? Question 1

Question

Question 15

What is the molarity of 6.00 g KBr in 1.50 L of solution?

Question 16

What is the oxidation number of N in HNO3?

Question 19

The specific heat capacity of liquid water is 4.18 J/g.K. How many joules of heat are needed to raise the temperature of 5.00 g of water from 25.3°C to 65.3°C?

Question 20

How much energy is needed to warm 15.0 g of lead (Pb) from 2.0 oC to 9.0 oC?

Question 23

How many joules need to be added to 4.50 g of glass (Pyrex) to raise its temperature by 25 K?

Question 24

What is the heat of reaction for the reaction

Fe(s) + O2 (g) Fe2O3? (not balanced)

(Hof (Fe2O3) = -824.2 kJ/mol ; Hof (Fe) = 0 kJ/mol ; Hof (O2) = 0 kJ/mol)

Question 28

Calculate the change internal energy (E) for a system that is giving off 42.9 kJ of heat and is performing 0.895 kJ of work on the surroundings.

Explanation / Answer

Question 15

What is the molarity of 6.00 g KBr in 1.50 L of solution?

by definition

M = mol/L

MW = 119.002 g/mol

mol = mass/MW = 6/119.002 = 0.05 mol

V = 1.5 L

so

M = 0.05/1.5 = 0.0333 M

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