Q: A balloon contains 30.1 g of CO$$_2 at 47$^\circC $$and a pressure of 73.1 kPa. How many moles of gas does the balloon contain? (R = 8.314 J/mol·K)

$$0.684$$ moles$$\;\text{CO}_2$$

Question 1

Which of the following is the correctly balanced equation for the reaction of nitrogen gas with hydrogen gas to form ammonia?

Accepted Answer

$$\mathrm{N_2$} + 3\mathrm{H_2$} \rightarrow 2\mathrm{NH_3$}$$

Question 2

What type of reaction occurs when potassium reacts with sodium nitride?

Accepted Answer

Synthesis

Question 3

Given the reaction $$4\mathrm{NH_3$} + 5\mathrm{O_2$} \rightarrow 4\mathrm{NO} + 6\mathrm{H_2O}$$, how many moles of oxygen gas are needed to react with 1.7 moles of ammonia?

Accepted Answer

$$2.125$$ moles

Question 4

Which of the following is the net ionic equation for the reaction between lithium hydroxide and barium chloride?

Accepted Answer

$$2\mathrm{OH^-} + \mathrm{Ba$$^{2+}$$} \rightarrow \mathrm{Ba(OH)_2}$$

Question 5

A balloon contains 30.1 g of CO$$_2 at 47$^\circC $$and a pressure of 73.1 kPa. How many moles of gas does the balloon contain? (R = 8.314 J/mol·K)

Accepted Answer

$$0.684$$ moles$$\;	ext{CO}_2$$

Question 6

Which of the following is the correct molecular equation for the reaction between potassium chromate and calcium chloride?

Accepted Answer

$$\mathrm{K_2CrO_4} + \mathrm{$$CaCl_2$$} \rightarrow \mathrm{$$CaCrO_4$$} + 2\mathrm{KCl}$$

Question 7

If 125.0 grams of NO vapor is mixed with 44.1 grams of CO$$_2$$ gas, and the total pressure of the mixture is 564 mmHg, what is the partial pressure of NO? (Molar mass NO = 30.01 g/mol, CO$$_2 = 44.01 g/$$mol)

Accepted Answer

$$376$$ mmHg

Question 8

Which of the following is the correct balanced equation for the reaction of aluminum with hydrochloric acid?

Accepted Answer

$$2\mathrm{Al} + 6\mathrm{HCl} \rightarrow 2\mathrm{$$AlCl_3$$} + 3\mathrm{H_2$}$$

Question 9

What is the concentration of a phosphoric acid solution if 91 mL are neutralized by 95 mL of 2.4 M K$$_2CO$_3$$ solution? (Assume complete neutralization and use the equation: $$2\mathrm{K_2CO_3} + 3\mathrm{H_3PO_4} \rightarrow 2\mathrm{K_3PO_4} + 3\mathrm{H_2O} + 2\mathrm{CO_2$})$$

Accepted Answer

$$1.67 M$$

Question 10

Which of the following is the correct net ionic equation for the reaction between copper(II) bromide and aluminum sulfate?

Accepted Answer

$$3\mathrm{Cu$$^{2+}$$} + 2\mathrm{Al} \rightarrow 3\mathrm{Cu} + 2\mathrm{Al$$^{3+}$$}$$

Question 11

If 47 grams of copper(II) chloride reacts with 61 grams of sodium nitrate, how many grams of sodium chloride can be formed? (Molar masses: CuCl$$_2 = 134.45 g/$$mol, NaNO$$_3 = 85.00 g/$$mol, NaCl = 58.44 g/mol)

Accepted Answer

$$40.8 g$$

Question 12

Which of the following is the correct balanced equation for the reaction between lithium nitride and sodium cyanide?

Accepted Answer

$$\mathrm{Li_3N} + 3\mathrm{NaCN} \rightarrow 3\mathrm{LiCN} + \mathrm{Na_3N}$$

Question 13

What is the correct complete ionic equation for the reaction between potassium chromate and calcium chloride?

Accepted Answer

$$2\mathrm{K^+} + \mathrm{$$CrO_4$$^{2-}} + \mathrm{Ca$$^{2+}$$} + 2\mathrm{Cl^-} \rightarrow \mathrm{$$CaCrO_4$$} + 2\mathrm{K^+} + 2\mathrm{Cl^-}$$

Question 14

Which of the following best describes the reaction type for the equation $$2\mathrm{K} + \mathrm{Cl_2$} \rightarrow 2\mathrm{KCl}$$?

Accepted Answer

Synthesis

Question 15

How many grams of NO are produced when 69.4 L of oxygen gas reacts with ammonia at STP? (1 mol gas = 22.4 L, $$4\mathrm{NH_3$} + 5\mathrm{O_2$} \rightarrow 4\mathrm{NO} + 6\mathrm{H_2O}$$, molar mass NO = 30.01 g/mol)

Accepted Answer

$$186 g$$

Question 16

Which of the following is the correct net ionic equation for the reaction between sodium carbonate and magnesium nitrate?

Accepted Answer

$$\mathrm{CO_3$^{2-}} + \mathrm{Mg$$^{2+}$$} \rightarrow \mathrm{$$MgCO_3$$}$$

Question 17

If 75 grams of lithium nitride react with 75 grams of sodium cyanide, how many grams of sodium nitride can be formed? (Molar masses: Li$$_3N = 34.83 g/$$mol, NaCN = 49.01 g/mol, Na$$_3N = 65.02 g/$$mol)

Accepted Answer

$$44.0 g$$

Question 18

Which of the following is the correct balanced equation for the reaction between sodium phosphate and calcium chloride?

Accepted Answer

$$2\mathrm{Na_3PO_4} + 3\mathrm{$$CaCl_2$$} \rightarrow 6\mathrm{NaCl} + \mathrm{Ca_3$(PO_4$)_2}$$

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