Equation for an enzyme-catalyzed reaction

Question

Show all work (where appropriate) for full credit. 1. Describe (steps, equipment and quantities) how to accurately prepare 250.0 mL of a 0.0075 M solution of NaCl (aq) from a 500 mL, 0.0500 M stock solution. 2. Describe (steps, equipment and quantities) how to accurately prepare 250.0 mL of a 0.0075 M solution of NaCl (aq) from 100 g of solid NaCl.

Answer 1

Question

Chapter 16.4, Problem 16.37PP

a)

Interpretation Introduction

To determine:

Equation for an enzyme-catalyzed reaction

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Show all work (where appropriate) for full credit. 1. Describe (steps, equipment and quantities) how to accurately prepare 250.0 mL of a 0.0075 M solution of NaCl (aq) from a 500 mL, 0.0500 M stock solution. 2. Describe (steps, equipment and quantities) how to accurately prepare 250.0 mL of a 0.0075 M solution of NaCl (aq) from 100 g of solid NaCl.

5. An unlabeled gas cylinder was recently found in the laboratory. A sample of the gas was removed and analyzed. A 500.0 mL sample of the gas at 15°C and a pressure of 736 mmHg was found to weigh 2.688 g. Determine the molar mass of the gas. What element is the gas?

4. Nitrogen gas is commonly sold in 49.0 L steal cylinders at a pressure of 150 atm. (a) How many moles of nitrogen are in the container if the temperature of the cylinder is 21°C. (b) How many moles of nitrogen will there be if the container above is heated to 100°C? (careful here) (c) What is the mass of nitrogen gas in the cylinder in part (a)? (d) What volume would the nitrogen occupy at 21°C, if the pressure was reduced to 1.02 atm? (e) What would be the pressure of the nitrogen gas in the cylinder when the temperature is raised to 39°C?