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IMU CET Composition of Substances and Solutions — practice questions — page 3

Explore 91 free Composition of Substances and Solutions questions in IMU CET Chemistry. Open each question or exercise to read its content, reference answers and available explanation.

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Composition of Substances and Solutions questions and exercises with answers

Showing questions 61–90 of 91.

What is the molarity of 6.52 g of CoCl2, molar mass 128.9 g/mol, dissolved to a total volume of 75.0 mL?Read the answer and worked solution →How many moles of NaCl are contained in 0.250 L of a 5.30 M solution?Read the answer and worked solution →How many grams of NaCl are in 0.250 L of a 5.30 M solution, given a molar mass of 58.44 g/mol?Read the answer and worked solution →How many grams of CaCl2, molar mass 110.98 g/mol, are in 250.0 mL of a 0.200 M solution?Read the answer and worked solution →What volume of 0.839 M vinegar contains 75.6 g of acetic acid, molar mass 60.05 g/mol?Read the answer and worked solution →What is dilution?Read the answer and worked solution →Why does the relation C1V1 = C2V2 hold across a dilution?Read the answer and worked solution →If 0.850 L of 5.00 M copper nitrate is diluted with water to 1.80 L, what is the new molarity?Read the answer and worked solution →What is the concentration when 25.0 mL of a 2.04 M methanol solution is diluted to 500.0 mL?Read the answer and worked solution →What volume of 0.12 M HBr can be prepared from 11 mL of 0.45 M HBr?Read the answer and worked solution →What volume of 0.125 M nitric acid can be prepared from 0.250 L of 1.88 M nitric acid?Read the answer and worked solution →What volume of 1.59 M KOH is needed to prepare 5.00 L of 0.100 M KOH?Read the answer and worked solution →What volume of 0.575 M glucose can be prepared from 50.00 mL of 3.00 M glucose?Read the answer and worked solution →Which of these is another common name for mass percentage?Read the answer and worked solution →A bleach bottle is labelled 7.4% sodium hypochlorite by mass. How much NaOCl is in a 100.0 g sample?Read the answer and worked solution →A 5.0 g sample of spinal fluid contains 3.75 mg of glucose. What is the percent by mass of glucose?Read the answer and worked solution →A tile cleanser contains 135 g of HCl and 775 g of water. What is the percent by mass of HCl?Read the answer and worked solution →Concentrated hydrochloric acid is 37.2% HCl by mass with a density of 1.19 g/mL. What mass of HCl is in 0.500 L?Read the answer and worked solution →What volume of concentrated HCl, 37.2% by mass with density 1.19 g/mL, contains 125 g of HCl?Read the answer and worked solution →Rubbing alcohol is 70% vol isopropanol. If isopropanol has density 0.785 g/mL, what mass is in a 355 mL bottle?Read the answer and worked solution →Wine is about 12% ethanol by volume. With ethanol at 46.06 g/mol and density 0.789 g/mL, how many moles are in 750 mL of wine?Read the answer and worked solution →What does a mass-volume percent compare?Read the answer and worked solution →Physiological saline is 0.9% mass/volume NaCl. How much NaCl is in 500 mL of it?Read the answer and worked solution →In what units is the concentration of glucose in blood usually reported?Read the answer and worked solution →How are the mass-based ppm and ppb units defined?Read the answer and worked solution →What maximum safe level of fluoride ion in tap water has the EPA identified?Read the answer and worked solution →A lead concentration in tap water of 15 ppb is equal to what concentration in ppm?Read the answer and worked solution →At a lead level of 15 ppb, what mass of lead is in a 300 mL glass of water of density 1.00 g/mL?Read the answer and worked solution →A 50.0 g sample of industrial wastewater contains 0.48 mg of mercury. What is the mercury concentration in ppm?Read the answer and worked solution →Express a mercury concentration of 9.6 ppm in parts per billion.Read the answer and worked solution →

Worked practice questions

What is the molarity of 6.52 g of CoCl2, molar mass 128.9 g/mol, dissolved to a total volume of 75.0 mL?

  1. 0.0506 M
  2. 0.0674 M
  3. 0.674 M
  4. 1.48 M
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Correct answer: C. 0.674 M

1. Convert the mass of solute to an amount: 6.52 g / 128.9 g/mol. 2. That gives 0.05058 mol of CoCl2. 3. Convert the volume: 75.0 mL / 1000 = 0.0750 L. 4. Divide the amount by the volume: 0.05058 mol / 0.0750 L. 5. The concentration is 0.674 M. 6. The value 0.0506 M reports the mole count without dividing by the volume at all. 7. The value 0.0674 M leaves the volume in millilitres, shifting the answer by a factor of ten. _Source: OpenStax Chemistry (CC BY 4.0), Ch 3 "Composition of Substances and Solutions", section 3.3 Molarity_

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How many moles of NaCl are contained in 0.250 L of a 5.30 M solution?

  1. 21.2 mol
  2. 1.325 mol
  3. 0.0472 mol
  4. 13.25 mol
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Correct answer: B. 1.325 mol

1. Rearranging the definition of molarity gives moles of solute = molarity x volume in litres. 2. Substituting gives 5.30 mol/L x 0.250 L. 3. The product is 1.325 mol of NaCl. 4. Units cancel correctly, since mol/L multiplied by L leaves mol. 5. The value 21.2 mol comes from dividing by 0.250 L instead of multiplying by it. _Source: OpenStax Chemistry (CC BY 4.0), Ch 3 "Composition of Substances and Solutions", section 3.3 Molarity_

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How many grams of NaCl are in 0.250 L of a 5.30 M solution, given a molar mass of 58.44 g/mol?

  1. 23.2 g
  2. 1.33 g
  3. 310 g
  4. 77.4 g
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Correct answer: D. 77.4 g

1. Start from the amount of solute: moles = molarity x litres. 2. That gives 5.30 mol/L x 0.250 L = 1.325 mol of NaCl. 3. Keep the trailing 5 as a guard digit rather than rounding to 1.32 mol at this stage. 4. Convert the amount to a mass: 1.325 mol x 58.44 g/mol. 5. The product is 77.4 g of NaCl. 6. Units cancel, since mol multiplied by g/mol leaves grams. 7. Rounding the intermediate to 1.32 mol first gives 77.1 g, which is the trap this calculation sets. _Source: OpenStax Chemistry (CC BY 4.0), Ch 3 "Composition of Substances and Solutions", section 3.3 Molarity_

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