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Get Full Access to Chemistry: The Central Science - 14 Edition - Chapter 4 - Problem 4.62
Get Full Access to Chemistry: The Central Science - 14 Edition - Chapter 4 - Problem 4.62

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# ?(a) Calculate the molarity of a solution made by dissolving 12.5 grams of $$\mathrm{Na}_{2} \mathrm{CrO}_{4}$$ in enough water to form exactly 750 mL

ISBN: 9780134414232 1274

## Solution for problem 4.62 Chapter 4

Chemistry: The Central Science | 14th Edition

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Problem 4.62

(a) Calculate the molarity of a solution made by dissolving 12.5 grams of $$\mathrm{Na}_{2} \mathrm{CrO}_{4}$$ in enough water to form exactly 750 mL of solution.

(b) How many moles of KBr are present in 150 mL of a 0.112 M solution?

(c) How many milliliters of 6.1 M HCl solution are needed to obtain 0.150 mol of HCl?

Text Transcription:

Na2CrO4

Step-by-Step Solution:

Step 1 of 5) How many moles of KBr are present in 150 mL of a 0.112 M solutionHow many milliliters of 6.1 M HCl solution are needed to obtain 0.150 mol of HClIf a calorimetry experiment is carried out under a constant pressure, the heat transferred provides a direct measure of the enthalpy change of the reaction. Constant-volume calorimetry is carried out in a vessel of fixed volume called a bomb calorimeter. The heat transferred under constant-volume conditions is equal to ∆E. Corrections can be applied to ∆E values to yield ∆H.Because enthalpy is a state function, ∆H depends only on the initial and final states of the system. Thus, the enthalpy change of a process is the same whether the process is carried out in one step or in a series of steps. Hess’s law states that if a reaction is carried out in a series of steps, ∆H for the reaction will be equal to the sum of the enthalpy changes for the steps. We can therefore calculate ∆H for any process, as long as we can write the process as a series of steps for which ∆H is known.

Step 2 of 2

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?(a) Calculate the molarity of a solution made by dissolving 12.5 grams of $$\mathrm{Na}_{2} \mathrm{CrO}_{4}$$ in enough water to form exactly 750 mL