Q: A beaker contains 0.056 kg of water. If an oxygen atom has a mass of $$2.66 \times 10$$^{-26}$$ g, how many moles of oxygen atoms have a mass equal to the water in the beaker?

$$2.11 \times 10$$^{27}$$ moles

Q: Convert $$8.45 \text{ kg} / \text{m}^3 to$$ $$\text{g} / \text{cm}^3.$$

$$0.00845 \text{ g} / \text{cm}^3$$

Q: A chemist measures the volume of an unknown liquid as $$0.583 \text{ L}$$ and its mass as $$900 \text{ g}. $$What is the density of the liquid in $$\text{g} / \text{cm}^3$$?

$$1.54 \text{ g} / \text{cm}^3$$

Q: Which of the following is the correct conversion factor to change kilometers to centimeters?

$$1 \text{ km} = 10^5$ \text{ cm}$$

Q: A sample contains $$2.66 \times 10$$^{-26}$$ g per atom. How many atoms are in 1$$ \text{ g}$$ of the sample?

$$3.76 \times 10$$^{25}$$ atoms

Q: Which of the following is the correct formula for density?

$$\text{Density} = \frac{\text{Mass}}{\text{Volume}}$$

Question 1

A beaker contains 0.056 kg of water. If an oxygen atom has a mass of $$2.66 	imes 10$$^{-26}$$ g, how many moles of oxygen atoms have a mass equal to the water in the beaker?

Accepted Answer

$$2.11 	imes 10$$^{27}$$ moles

Question 2

Convert $$8.45 	ext{ kg} / 	ext{m}^3 to$$ $$	ext{g} / 	ext{cm}^3.$$

Accepted Answer

$$0.00845 	ext{ g} / 	ext{cm}^3$$

Question 3

You want to fill a square cup all the way to the top with water. How many milliliters of water will you need if the cup has the dimensions $$1.2 	ext{ in} 	imes 1.3 	ext{ in} 	imes 2.1 	ext{ in}$$?

Accepted Answer

$$67.8 	ext{ mL}$$

Question 4

A chemist measures the volume of an unknown liquid as $$0.583 	ext{ L}$$ and its mass as $$900 	ext{ g}. $$What is the density of the liquid in $$	ext{g} / 	ext{cm}^3$$?

Accepted Answer

$$1.54 	ext{ g} / 	ext{cm}^3$$

Question 5

A chemistry student needs $$6.6 	ext{ g} of $$pentane for an experiment. The density of pentane is $$0.626 	ext{ g} / 	ext{cm}^3. $$What volume of pentane should the student use?

Accepted Answer

$$10.5 	ext{ cm}^3$$

Question 6

Which of the following is the correct conversion factor to change kilometers to centimeters?

Accepted Answer

$$1 	ext{ km} = 10^5$ 	ext{ cm}$$

Question 7

If a chemist identifies an unknown liquid with a density of $$1.26 	ext{ g} / 	ext{cm}^3$$, which of the following substances is it most likely to be?

Accepted Answer

carbon tetrachloride

Question 8

A student measures the mass of a sample as $$0.056 	ext{ kg}. $$How many grams is this?

Accepted Answer

$$56 	ext{ g}$$

Question 9

Which of the following best describes the process of identifying an unknown liquid using density?

Accepted Answer

Compare the measured density to known values in a reference table.

Question 10

A student needs to convert $$2.54 	ext{ cm} to $$inches. What is the correct value?

Accepted Answer

$$1 	ext{ in}$$

Question 11

If the density of ethanol is $$0.789 	ext{ g} / 	ext{cm}^3$$, what is the mass of $$250 	ext{ mL} of $$ethanol?

Accepted Answer

$$197.25 	ext{ g}$$

Question 12

A chemist has $$1.609 	ext{ km} of $$wire. How many meters of wire does the chemist have?

Accepted Answer

$$1609 	ext{ m}$$

Question 13

Which of the following is the correct value for Avogadro's number?

Accepted Answer

$$6.022 	imes 10$$^{23}$$

Question 14

A student wants to convert $$1.2 	ext{ in} to $$centimeters. What is the correct value?

Accepted Answer

$$3.05 	ext{ cm}$$

Question 15

If a liquid has a density of $$1.6 	ext{ g} / 	ext{cm}^3$$ and a volume of $$250 	ext{ mL}$$, what is its mass?

Accepted Answer

$$400 	ext{ g}$$

Question 16

A sample contains $$2.66 	imes 10$$^{-26}$$ g per atom. How many atoms are in 1$$ 	ext{ g}$$ of the sample?

Accepted Answer

$$3.76 	imes 10$$^{25}$$ atoms

Question 17

Which of the following is the correct formula for density?

Accepted Answer

$$	ext{Density} = \frac{	ext{Mass}}{	ext{Volume}}$$

Question 18

A student has $$0.583 	ext{ L} of a $$liquid. How many $$	ext{cm}^3 is $$this?

Accepted Answer

$$583 	ext{ cm}^3$$

Question 19

If a student needs $$250 	ext{ mL} of $$water, how many liters is this?

Accepted Answer

$$0.25 	ext{ L}$$

General Chemistry Study Notes: Units, Density, and Moles

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