Question 8 What is the mass percent concentration of a NaOH solution formed by mixing 50.0 mL of a 25.0 mass 9% NAOH solution with 10.0 mL of water? O a. 2.50% O b. 12.596 O C. 23.196 O d. 5.00% O e. 20.89%
Question 8 What is the mass percent concentration of a NaOH solution formed by mixing 50.0 mL of a 25.0 mass 9% NAOH solution with 10.0 mL of water? O a. 2.50% O b. 12.596 O C. 23.196 O d. 5.00% O e. 20.89%
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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Transcribed Image Text:Question 8
What is the mass percent concentration of a NaOH solution formed by mixing 50.0 mL of a 25.0 mass % NaOH solution with 10.0 mL of water?
O a. 2.50%
O b. 12.59%
O c. 23.19%6
O d. 5.00%
O e. 20.8%
Transcribed Image Text:Question 9
Hydrazine, N2H4, is a liquid used as a rocket fuel. It reacts with oxygen to yield nitrogen gas and water according to the following reaction...
N2H4() + O2(g) N2(g) + 2 H20(1) AH = -622 kJ
Determine the standard enthalpy change for the reaction
2 N2(g) +4 H20(1) 2 N2H4(1) + 2 02(g)
O a. -311 kJ
O b. 1244 k)
OC. 311 kJ
O d. 622 kJ
O e. -1244 kJ
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To determine:
The mass percent concentration of a NaOH solution formed by mixing 50.0 mL of a 25.0% NaOH solution with 10.0 mL of water.
Volume of NaOH = 50.0 mL of a 25.0% NaOH
Volume of NaOH= 50.00 mL x (25.0/100.0)
The volume of NaOH= 12.5 mL
Volume of water = 10.0 mL
Total volume of solution = 10.0 mL +50.0 mL = 60.0 mL
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