Q: Which of the following is the correct molecular formula and molar mass for aspirin?

$$\mathrm{C}_9\mathrm{H}_8\mathrm{O}_4$$, 180.16 \text{ g/mol}$

Question 1

A pediatric patient weighs 43.5 lbs. The recommended dose for ibuprofen for this age group is 8.50 mg/kg. How many milligrams of ibuprofen should this patient receive?

Accepted Answer

$$166 	ext{ mg}$$

Question 2

Children’s Tylenol Oral Suspension is sold as a solution with a concentration of $$160 	ext{ mg}/5.0 	ext{ mL}. $$For a patient of 20.0 lbs for five years, the dose of a fever is $$7.5 	ext{ mL}. $$How many milligrams of Tylenol is the patient receiving with this dose?

Accepted Answer

$$240 	ext{ mg}$$

Question 3

A solution has a density of $$1.06 	ext{ g/mL}. $$What is the volume of a $$25 	ext{ g}$$ sample of this solution?

Accepted Answer

$$23.6 	ext{ mL}$$

Question 4

Which of the following is the correct expanded formula for magnesium phosphate?

Accepted Answer

$$\mathrm{Mg}_3(\mathrm{PO}_4)_2$$

Question 5

What is the electron pair geometry and molecular shape of $$\mathrm{CCl}_4$$?

Accepted Answer

Electron pair geometry: Tetrahedral; Molecular shape: Tetrahedral

Question 6

Which intermolecular force is most prevalent in $$\mathrm{SBr}_2$$ and $$\mathrm{CCl}_4$$?

Accepted Answer

Dispersion forces

Question 7

A sample of argon gas ($$0.36 	ext{ mol}$$ and $$500.0 	ext{ mL}) is $$transferred to a container at STP. What is the volume of the gas at STP?

Accepted Answer

$$8.06 	ext{ L}$$

Question 8

Calculate the pH of a solution with $$[\mathrm{H}_3\mathrm{O}^+] = 2.7 	imes 10$$^{-7}$$.

Accepted Answer

$$6.57$$

Question 9

Which of the following is the correct net ionic equation for the reaction between aqueous solutions of lead(II) nitrate and sodium bromide?

Accepted Answer

$$\mathrm{Pb}^{2+}(aq) + 2\mathrm{Br}^-(aq) \rightarrow \mathrm{PbBr}_2(s)$$

Question 10

Which of the following molecules contains a chiral carbon?

Accepted Answer

2-bromo-1-hexanol

Question 11

What is the correct formula for lithium phosphide?

Accepted Answer

$$\mathrm{Li}_3\mathrm{P}$$

Question 12

Which of the following is the correct formula for sodium nitrite?

Accepted Answer

$$\mathrm{NaNO}_2$$

Question 13

Which of the following is the correct molecular formula and molar mass for aspirin?

Accepted Answer

$$\mathrm{C}_9\mathrm{H}_8\mathrm{O}_4$$, 180.16 	ext{ g/mol}$

Question 14

Which of the following is the correct equation for the dissociation of acetic acid in water?

Accepted Answer

$$\mathrm{CH}_3\mathrm{COOH}(aq) + \mathrm{H}_2\mathrm{O}(l) \rightleftharpoons \mathrm{CH}_3\mathrm{COO}^-(aq) + \mathrm{H}_3\mathrm{O}^+(aq)$$

Question 15

Which of the following is the correct formula for copper(II) hydroxide?

Accepted Answer

$$\mathrm{Cu(OH)}_2$$

Question 16

Which of the following is the correct formula for iron(II) oxide?

Accepted Answer

$$\mathrm{FeO}$$

Question 17

Which of the following is the correct formula for sodium nitrate?

Accepted Answer

$$\mathrm{NaNO}_3$$

Question 18

Which of the following is the correct formula for sulfur dibromide?

Accepted Answer

$$\mathrm{SBr}_2$$

Question 19

Which of the following is the correct formula for carbon tetrachloride?

Accepted Answer

$$\mathrm{CCl}_4$$

GOB Chemistry Exam Review and Study Guide

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