Solving a word equation?
a) 0.761 mol of KCl
b) 31.8 g of KCl
Answer:
0.256 M KCl contains 0.256 moles of KCl in 1 L
0.761 mole / 0.256 moles per liter = 2.973 L or 2973 mL
MW KCl = 74.557
31.8 g KCl / 74.557 = 0.4265 moles
0.4265 moles / 0.256 moles per liter = 1.666 L or 1666 mL
Set up ratios and solve
0.256 M KCl contains 0.256 moles dissolved in 1,000 mL of solution.
Calcualte the molar mass of KCl. Multiply by 0.256 and you have grams per 1,000 mL.
With this information, you can set the ratios and solve your 2 questions
0.256 M is 0.256 mole per liter.
Divide 0.761 by 0.256 and you'll know how many liters you need (it'll be something less than 3 liters).
Don't forget to convert to milliliters. (Multiply by 1000)
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