How many moles of enzyme are in 0.142 L of a 2.99 × 10-5 M solution?

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
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A 0.358 g sample of an unknown enzyme is dissolved in water to make 0.142 L of solution. The osmotic pressure of the
solution at 25 'C is found to be 0.740 mbar. Calculate the molecular mass of the enzyme.
STRATEGY
1. Determine the molarity of the enzyme solution.
2. Determine the moles of enzyme.
3. Calculate the molecular mass of the enzyme.
You can determine the molarity of the solution based on the osmotic pressure.
* = R T M (where R = 0.08314 L bar K-. mol-)
1 bar
(0.740 mbar)
1000 mbar
M =
RT
= 2.99 x 10-$ mol · L-!
(0.08314 L bar K- · mol-) (298 K)
How many moles of enzyme are in 0.142 L of a 2.99 × 10-$ M solution?
moles of enzyme:
Question Source: MRG-General Chemistry
MacBook Air
F6
F7
F8
F9
F10
&
7
8
5
%24
Transcribed Image Text:A 0.358 g sample of an unknown enzyme is dissolved in water to make 0.142 L of solution. The osmotic pressure of the solution at 25 'C is found to be 0.740 mbar. Calculate the molecular mass of the enzyme. STRATEGY 1. Determine the molarity of the enzyme solution. 2. Determine the moles of enzyme. 3. Calculate the molecular mass of the enzyme. You can determine the molarity of the solution based on the osmotic pressure. * = R T M (where R = 0.08314 L bar K-. mol-) 1 bar (0.740 mbar) 1000 mbar M = RT = 2.99 x 10-$ mol · L-! (0.08314 L bar K- · mol-) (298 K) How many moles of enzyme are in 0.142 L of a 2.99 × 10-$ M solution? moles of enzyme: Question Source: MRG-General Chemistry MacBook Air F6 F7 F8 F9 F10 & 7 8 5 %24
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