(Solved) Chemistry - Solve for the concentration units and comparison of concentration units

RioNii

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2 years ago

Chemistry - Solve for the concentration units and comparison of concentration units

Solve for the concentration units and comparison of concentration units in the following problems. Box your final answer with two decimal places.

1. What is the molarity when 25.0 g of the compound NaCl (molar mass=58.44 g/mole) is placed in 85.0 mL of total solution?
My answer: 5.03 M

2. What is the molality when 115 g of sucrose (molar mass=342 g/mole) is placed in 375 g of water?
My answer: 0.897 M

3. What is the percent by mass of solution when 65.3 g of the compound KNO3 (molar mass=101 g/mole) is placed in 161 g of water (molar mass=18.0 g/mole)?
My answer: 28.9%

4. How many grams of the solute MgSO4 (molar mass=120 g/mole) are required to make 75.0 mL of a solution that is 0.445 M?
My answer: 4.01g

5. A solution that is 7.56% by mass NaNO3 (molar mass=85.0 g/mole) in water (molar mass=18.0 g/mole) has a density of 1.09 g/mL. What is its molarity?
My answer: 0.970 M

6. How many grams of water (molar mass=18.0 g/mole) must be added to 20.0 grams of CaCO3 (molar mass=100 g/mole) to make an aqueous solution that has a mole fraction of solute of 0.100?
My answer: 32.4g

Are my answers correct?

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bio_man

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RioNii Author

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2 years ago

Thank you sir! But how would the answers look like in two decimal places?

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bio_man

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Educator

2 years ago

Like this:

1. What is the molarity when 25.0 g of the compound NaCl (molar mass=58.44 g/mole) is placed in 85.0 mL of total solution?
My answer: 5.03 M

2. What is the molality when 115 g of sucrose (molar mass=342 g/mole) is placed in 375 g of water?
My answer: 0.90 M

3. What is the percent by mass of solution when 65.3 g of the compound KNO3 (molar mass=101 g/mole) is placed in 161 g of water (molar mass=18.0 g/mole)?
My answer: 28.90 %

4. How many grams of the solute MgSO4 (molar mass=120 g/mole) are required to make 75.0 mL of a solution that is 0.445 M?
My answer: 4.01 g

5. A solution that is 7.56% by mass NaNO3 (molar mass=85.0 g/mole) in water (molar mass=18.0 g/mole) has a density of 1.09 g/mL. What is its molarity?
My answer: 0.97 M

6. How many grams of water (molar mass=18.0 g/mole) must be added to 20.0 grams of CaCO3 (molar mass=100 g/mole) to make an aqueous solution that has a mole fraction of solute of 0.100?
My answer: 32.40 g

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RioNii Author

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2 years ago

Thank you so much sir!

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