Q: How many molecules of $\mathrm{HCl}$ are formed when 60.0 g of water reacts according to $2\ \mathrm{ICl_3} + 3\ \mathrm{H_2O} \rightarrow \mathrm{ICl} + \mathrm{HIO_3} + 5\ \mathrm{HCl}$? (Assume excess $\mathrm{ICl_3}$ and answer in scientific notation.)

$3.34 \times 10^{24}$ molecules

Question 1

A 65.5 mL sample of 0.210 M $\mathrm{AlCl_3}$ solution is prepared. How many $\mathrm{Al^{3+}}$ ions are present in the solution? (Avogadro's number $= 6.022 	imes 10^{23}$ mol$^{-1}$)

Accepted Answer

$8.28 	imes 10^{21}$ ions

Question 2

If 25.0 g of $\mathrm{NO_2}$ are consumed in the reaction $3\ \mathrm{NO_2}(g) + \mathrm{H_2O}(l) \rightarrow 2\ \mathrm{HNO_3}(aq) + \mathrm{NO}(g)$ and the percent yield is 75.0%, how many grams of $\mathrm{HNO_3}$ are produced?

Accepted Answer

17.1 g

Question 3

How many grams of $\mathrm{NaCl}$ are required to make 300.0 mL of a 2.500 M solution?

Accepted Answer

43.83 g

Question 4

Which pair of reactants will result in a precipitation reaction when mixed?

Accepted Answer

$\mathrm{Mg(NO_3)_2(aq)}$ and $\mathrm{Li_2CO_3(aq)}$

Question 5

How many molecules of $\mathrm{HCl}$ are formed when 60.0 g of water reacts according to $2\ \mathrm{ICl_3} + 3\ \mathrm{H_2O} \rightarrow \mathrm{ICl} + \mathrm{HIO_3} + 5\ \mathrm{HCl}$? (Assume excess $\mathrm{ICl_3}$ and answer in scientific notation.)

Accepted Answer

$3.34 	imes 10^{24}$ molecules

Question 6

What is the concentration of nitrate ions in a 0.125 M $\mathrm{Ba(NO_3)_2}$ solution?

Accepted Answer

0.250 M

Question 7

A student reacts 8.0 mol $\mathrm{Al_2S_3}$ with 8.0 mol $\mathrm{H_2O}$ according to $\mathrm{Al_2S_3(s)} + 6\ \mathrm{H_2O(l)} \rightarrow 2\ \mathrm{Al(OH)_3(s)} + 3\ \mathrm{H_2S(g)}$. What is the theoretical yield of $\mathrm{H_2S}$ (in moles)?

Accepted Answer

4.0 mol

Question 8

How many grams of $\mathrm{CaCl_2}$ are formed when 25.00 mL of 0.00237 M $\mathrm{Ca(OH)_2}$ reacts with excess $\mathrm{Cl_2}$ gas? ($2\ \mathrm{Ca(OH)_2(aq)} + 2\ \mathrm{Cl_2(g)} \rightarrow \mathrm{Ca(OCl)_2(aq)} + \mathrm{CaCl_2(s)} + 2\ \mathrm{H_2O(l)}$)

Accepted Answer

0.00329 g

Question 9

Which reagent could be used to separate $\mathrm{Cl^-}$ from $\mathrm{CH_3CO_2^-}$ when added to an aqueous solution containing both?

Accepted Answer

$\mathrm{AgNO_3(aq)}$

Question 10

How many of the following compounds are soluble in water? $\mathrm{Cu(OH)_2}$, $\mathrm{KNO_3}$, $\mathrm{NH_4I}$, $\mathrm{Li_2S}$

Accepted Answer

3

Question 11

Dinitrogen monoxide gas decomposes to form nitrogen gas and oxygen gas. How many grams of oxygen are formed when 30.0 g of dinitrogen monoxide decomposes? ($\mathrm{N_2O} \rightarrow \mathrm{N_2} + \frac{1}{2}\mathrm{O_2}$)

Accepted Answer

10.9 g

Question 12

Consider the reaction $\mathrm{C_3H_7SH(l)} + \mathrm{O_2(g)} \rightarrow \mathrm{CO_2(g)} + \mathrm{SO_2(g)} + \mathrm{H_2O(g)}$. How many moles of oxygen are required to produce 6.00 moles of water, assuming excess $\mathrm{C_3H_7SH}$?

Accepted Answer

9.00 moles

Question 13

An $\mathrm{FeCl_3}$ solution is 0.175 M. How many mL of this solution are needed to make 450. mL of a solution that is 0.300 M in $\mathrm{Cl^-}$ ion?

Accepted Answer

257 mL

Question 14

According to the unbalanced reaction $\mathrm{NO_2(g)} + \mathrm{H_2O(l)} \rightarrow \mathrm{HNO_3(aq)} + \mathrm{NO(g)}$, how many moles of $\mathrm{NO}$ are formed from 2.50 moles of $\mathrm{NO_2}$ if there is plenty of water present?

Accepted Answer

0.834 moles

Question 15

How many moles of $\mathrm{LiBr}$ are contained in 258.6 mL of 0.0296 M $\mathrm{LiBr}$ solution?

Accepted Answer

$7.65 	imes 10^{-3}$ mol

Question 16

Magnesium burns in air to produce magnesium oxide: $2\ \mathrm{Mg(s)} + \mathrm{O_2(g)} \rightarrow 2\ \mathrm{MgO(s)}$. When 2.50 g of magnesium burns, what is the theoretical yield of magnesium oxide in grams? (Molar mass Mg = 24.31 g/mol, MgO = 40.30 g/mol)

Accepted Answer

4.15 g

Question 17

Identify the spectator ions (include the charge) in the following molecular equation: $\mathrm{NaCl(aq)} + \mathrm{AgNO_3(aq)} \rightarrow \mathrm{AgCl(s)} + \mathrm{NaNO_3(aq)}$.

Accepted Answer

$\mathrm{Na^+}$ and $\mathrm{NO_3^-}$

Question 18

Which pair of compounds is soluble in water?

Accepted Answer

$\mathrm{NaI}$ and $\mathrm{Ni(NO_3)_2}$

Question 19

When $6.00 	imes 10^{22}$ molecules of ammonia react with $5.00 	imes 10^{22}$ molecules of oxygen according to $4\ \mathrm{NH_3(g)} + 3\ \mathrm{O_2(g)} ightarrow 2\ \mathrm{N_2(g)} + 6\ \mathrm{H_2O(g)}$, how many grams of nitrogen gas are produced?

Accepted Answer

1.39 g

General Chemistry Exam Study Guidance

Study Guide - Practice Questions

Study Guide - Flashcards