Q: A laboratory experiment requires you to convert 150 lbs to kilograms before using the value in a calculation. Which of the following is the correct conversion?

$$150 \times \frac{1}{2.2} = 68.2\ \text{kg}$$

Q: You are given a measurement of 850 ft and asked to convert it to kilometers. Which conversion factors should you use?

$$850\ \text{ft} \times \frac{0.305\ \text{m}}{1\ \text{ft}} \times \frac{1\ \text{km}}{1000\ \text{m}}$$

Q: A patient’s weight is recorded as 176 lbs. What is the mass in grams?

$$176\ \text{lbs} \times \frac{450\ \text{g}}{1\ \text{lb}} = 79,200\ \text{g}$$

Q: Convert 100 ft$$^2 to m$^2. $$Which calculation is correct?

$$100\ \text{ft}^2 \times \left(\frac{0.305\ \text{m}}{1\ \text{ft}}\$$right)^2$$ = 9.3\ \text{m}^2$$

Q: A car travels at 67.5 mi/hr. What is its speed in m/s?

$$67.5\ \text{mi/hr} \times \frac{1\ \text{km}}{0.621\ \text{mi}} \times \frac{1000\ \text{m}}{1\ \text{km}} \times \frac{1\ \text{hr}}{3600\ \text{s}} = 30.2\ \text{m/s}$$

Q: How many gallons are in 1 cubic meter ($$1\ \text{m}^3$$)?

$$1\ \text{m}^3 \times \frac{1000\ \text{L}}{1\ \text{m}^3} \times \frac{1\ \text{gal}}{3.79\ \text{L}} = 264\ \text{gal}$$

Q: The speed of light is $$3.00 \times 10^8$ m/s. What is this speed in yards per week (yd/wk)?

$$3.00 \times 10^8$\ \text{m/s} \times \frac{1\ \text{yd}}{0.914\ \text{m}} \times \frac{604,800\ \text{s}}{1\ \text{wk}} = 1.98 \times 10$$^{14}$$\ \text{yd/wk}$$

Q: Which of the following is the correct conversion for 1 oz to grams?

$$1\ \text{oz} \times 28.4\ \text{g} = 28.4\ \text{g}$$

Q: A recipe calls for 2 gallons of water. How many liters is this?

$$2\ \text{gal} \times 3.79\ \text{L} = 7.58\ \text{L}$$

Q: A marathon is 26.2 miles long. How many kilometers is this?

$$26.2\ \text{mi} \times \frac{1\ \text{km}}{0.621\ \text{mi}} = 42.2\ \text{km}$$

Question 1

A laboratory experiment requires you to convert 150 lbs to kilograms before using the value in a calculation. Which of the following is the correct conversion?

Accepted Answer

$$150 	imes \frac{1}{2.2} = 68.2\ 	ext{kg}$$

Question 2

You are given a measurement of 850 ft and asked to convert it to kilometers. Which conversion factors should you use?

Accepted Answer

$$850\ 	ext{ft} 	imes \frac{0.305\ 	ext{m}}{1\ 	ext{ft}} 	imes \frac{1\ 	ext{km}}{1000\ 	ext{m}}$$

Question 3

A patient’s weight is recorded as 176 lbs. What is the mass in grams?

Accepted Answer

$$176\ 	ext{lbs} 	imes \frac{450\ 	ext{g}}{1\ 	ext{lb}} = 79,200\ 	ext{g}$$

Question 4

Convert 100 ft$$^2 to m$^2. $$Which calculation is correct?

Accepted Answer

$$100\ 	ext{ft}^2 	imes \left(\frac{0.305\ 	ext{m}}{1\ 	ext{ft}}\$$right)^2$$ = 9.3\ 	ext{m}^2$$

Question 5

A car travels at 67.5 mi/hr. What is its speed in m/s?

Accepted Answer

$$67.5\ 	ext{mi/hr} 	imes \frac{1\ 	ext{km}}{0.621\ 	ext{mi}} 	imes \frac{1000\ 	ext{m}}{1\ 	ext{km}} 	imes \frac{1\ 	ext{hr}}{3600\ 	ext{s}} = 30.2\ 	ext{m/s}$$

Question 6

How many gallons are in 1 cubic meter ($$1\ 	ext{m}^3$$)?

Accepted Answer

$$1\ 	ext{m}^3 	imes \frac{1000\ 	ext{L}}{1\ 	ext{m}^3} 	imes \frac{1\ 	ext{gal}}{3.79\ 	ext{L}} = 264\ 	ext{gal}$$

Question 7

The speed of light is $$3.00 	imes 10^8$ m/s. What is this speed in yards per week (yd/wk)?

Accepted Answer

$$3.00 	imes 10^8$\ 	ext{m/s} 	imes \frac{1\ 	ext{yd}}{0.914\ 	ext{m}} 	imes \frac{604,800\ 	ext{s}}{1\ 	ext{wk}} = 1.98 	imes 10$$^{14}$$\ 	ext{yd/wk}$$

Question 8

Which of the following is the correct conversion for 1 oz to grams?

Accepted Answer

$$1\ 	ext{oz} 	imes 28.4\ 	ext{g} = 28.4\ 	ext{g}$$

Question 9

A recipe calls for 2 gallons of water. How many liters is this?

Accepted Answer

$$2\ 	ext{gal} 	imes 3.79\ 	ext{L} = 7.58\ 	ext{L}$$

Question 10

A marathon is 26.2 miles long. How many kilometers is this?

Accepted Answer

$$26.2\ 	ext{mi} 	imes \frac{1\ 	ext{km}}{0.621\ 	ext{mi}} = 42.2\ 	ext{km}$$

Question 11

Which of the following is the correct conversion for 1 inch to centimeters?

Accepted Answer

$$1\ 	ext{in} 	imes 2.54\ 	ext{cm} = 2.54\ 	ext{cm}$$

Question 12

A hospital needs to convert 5,000 mL of saline solution to cubic centimeters (cm$$^3). $$What is the correct conversion?

Accepted Answer

$$5,000\ 	ext{mL} 	imes 1\ 	ext{cm}^3 = 5,000\ 	ext{cm}^3$$

Question 13

A scientist needs to convert 1 L to quarts. Which conversion factor should be used?

Accepted Answer

$$1\ 	ext{L} 	imes 1.06\ 	ext{qt} = 1.06\ 	ext{qt}$$

Question 14

Which of the following best describes the process for converting units with exponents (e.g., ft$$^2 to m$^2$$)?

Accepted Answer

Multiply the conversion factor as many times as the exponent number.

Question 15

A student needs to convert 1 km to miles. Which conversion factor should be used?

Accepted Answer

$$1\ 	ext{km} 	imes 0.621\ 	ext{mi} = 0.621\ 	ext{mi}$$

Question 16

Which step is NOT part of the recommended process for converting units?

Accepted Answer

Add all conversion factors together before multiplying.

Unit Conversions in General Chemistry -20th July Public

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