eboniwiley
17.06.2021 •
Chemistry
What is the molarity of 750 mL of NaCl solution that contains 21.04 g of
NaCl?
The Periodic Table
A. 0.028 mol/L
B. 0.48 mol/L
C. 28 mol/L
D. 4.8 x 10-4 mol/L
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Ответ:
volume of solution = 750 mL = 0.750 L
mass of solute = 21.04 g
solute: NaCl
Required:molarity
Solution:Step 1: Calculate the molar mass of solute.
molar mass of solute = (22.99 g/mol × 1) + (35.45 g/mol × 1)
molar mass of solute = 58.44 g/mol
Step 2: Calculate the number of moles of solute.
moles of solute = mass of solute / molar mass of solute
moles of solute = 21.04 g / 58.44 g/mol
moles of solute = 0.360027 mol
Step 3: Calculate the molarity.
molarity = moles of solute / volume of solution
molarity = 0.360027 mol / 0.750 L
molarity = 0.48 mol/L
B. 0.48 mol/L
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Ответ:
The answer is Both are used for energy storage, but only carbohydrates are used for short-term energy storage.
Explanation:
I did the test and got it right
Thus the answer is b.