A student wants to measure the heat of neutralization reaction. To do this they mixed in a coffer cup calorimeter 58.0 mL of 0.50M HCl solution and 42.0 mL of 0.60M NaOH solution both at 22.0oC initially. They then continued to measure the temperature of the mixture for 10 minutes. What is the SURROUNDING of this reaction?

Explanation:

Determine the molar masses to the nearest whole number.

NaoH

First, use the molar masses of N and O to determine the molar mass of N2O5.

2 mol N 14.0 g N

1 mol N

× + 5 mol O 16.0 g O

1 mol O

× -1 = 108.0 g mol ⋅

Next, use the molar mass to convert the given moles into mass.

3.24 mol N O2 5 × 2 5

2 5

108.0 g N O

1 mol N O 2 5 = 350. g N O

b) How many moles of N2O5 are present in a 12.7-g sample of N2O5?

Use the molar mass determined in Part A to convert from mass to moles.

12.7 g N O2 5 × 2 5

2 5

1 mol N O

108.0 g N O 2 5

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