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

$\mathrm{CCl}_4$

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