Q: How many water molecules are present in 2.50 mol of $$H_2O$$? Use Avogadro's number $$6.022 \times 10$$^{23}$$ molecules/mol.

$$1.51 \times 10$$^{24}$$ molecules

Question 1

How many water molecules are present in 2.50 mol of $$H_2O$$? Use Avogadro's number $$6.022 	imes 10$$^{23}$$ molecules/mol.

Accepted Answer

$$1.51 	imes 10$$^{24}$$ molecules

Question 2

Which molecule has the largest molar mass?

Accepted Answer

$$C_3H_8O_3$$

Question 3

A patient is diagnosed with gout due to elevated uric acid. If the patient has 281.7 g of uric acid in their body, how many moles of uric acid is this? (Molar mass = 168.11 g/mol)

Accepted Answer

$$0.601$$ mol

Question 4

Given the reaction $$3NO_2(g) + H_2O(g) \rightarrow 2HNO_3(g) + NO(g)$$, how many moles of $$H_2O$$ are required to react completely with 6 moles of $$NO_2$$?

Accepted Answer

2 moles

Question 5

How many grams of $$H_2O$$ are required to react completely with 3.0 moles of $$NO_2 in $$the reaction $$3NO_2(g) + H_2O(g) \rightarrow 2HNO_3(g) + NO(g)$$? ($$M_{H_2O} = 18.02 g/$$mol)

Accepted Answer

$$18 g$$

Question 6

How many moles of NaCl are in 3.75 L of a 0.485 M solution?

Accepted Answer

$$1.82$$ mol

Question 7

Which compound acts as a base when dissolved in water?

Accepted Answer

$$Ca(OH)_2$$

Question 8

A sample of lake water has a pH of 6.3. Which description best characterizes this sample?

Accepted Answer

slightly acidic

Question 9

Which reaction is NOT an acid-base neutralization?

Accepted Answer

$$BaCl_2(aq) + Na_2SO_4(aq$$) \rightarrow $$BaSO_4(s) + 2$$NaCl(aq)$$

Question 10

How many moles of $$HCl$$ are required to completely neutralize 1.85 moles of $$Mg(OH)_2$$? Use the reaction: $$2HCl(aq) + Mg(OH)_2(aq) \rightarrow 2H_2O(l) + $$MgCl_2$$(aq).$$

Accepted Answer

$$3.70$$ mol

Question 11

If 16.2 mL of a 0.125 M $$HNO_3$$ solution is required to completely neutralize 10.5 mL of a NaOH solution, what is the concentration of the NaOH?

Accepted Answer

$$0.193 M$$

Question 12

Which chemical equation correctly represents the synthesis of methanol ($$CH_3OH) $$based on the equilibrium expression $$K = \frac{[CH_3OH]}{[CO][H_2$]^2}$$?

Accepted Answer

$$CO(g) + 2H_2(g) \rightleftharpoons CH_3OH(g)$$

Question 13

Two sealed containers each have a volume of 1.25 L and are at 95°C. One contains 2.75 g of He, the other 2.75 g of Ar. Which statement is correct?

Accepted Answer

The flask containing helium has a higher pressure than the flask containing argon.

Question 14

Which of the following bonds is the most polar covalent bond?

Accepted Answer

$$C-O$$

Question 15

Refer to the Lewis structures shown. Classify $$PBr_3$$ and $$CH_2O as $$polar or nonpolar.

Accepted Answer

$$PBr_3 is $$polar, $$CH_2O is $$polar

Question 16

Based on the structure of serine and water, what is the most important type of intermolecular force between the side chain of serine and water?

Accepted Answer

hydrogen bonds

Question 17

What is the correct name for $$BF_3$$?

Accepted Answer

boron trifluoride

Question 18

Gold-198 has a half-life of 2.7 days. How many days is three half-lives?

Accepted Answer

8.1 d

Question 19

A nurse must administer a 40 mg dose of Solu-Medrol. The solution contains 12.5 mg/2 mL. How many mL should be given per dose?

Accepted Answer

6.4 mL/dose

Question 20

Which pair of atoms is most likely to form a covalent bond?

Accepted Answer

C and O

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