Hnrs Chem. Sem. 1

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How many moles are there in 5.3 x 10²² molecules of F₂?

.088 mol

How many moles are there in 15.5 g of SiO₂?

.258 mol

Calculate the molarity of the following solution: 24.6 grams KCl in 750 mL solution

.440 M

5C + 2SO₂ → CS₂ + 4CO How many moles of CS₂ are needed to form when 2.7 moles C reacts?

0.54 mol CS₂

2Al + 3Cl₂ → 2AlCl₃ with 3.00 g Al and 5.3 g Cl₂ Calculate how many grams of the excess reactant remains after the reaction is complete.

1.7 g Al

How many grams are there in 14.4 L of CH₄?

10.3 g

Sb₂S₃ + 3Fe → 2Sb + 3FeS When 15.0 g Sb2S3 reacts with an excess of Fe, 9.84 g Sb is produced. What is the percent yield of this reaction?

10.8 g Sb 91.1% Sb

What is the molar mass of CaCO₃?

100.1 g

How many grams of the solute is needed to make 500 mL of a 2.0 M solution if KNO₃

101.1 g

How many grams are there in 1.50 moles of C₅H₁₂?

108 g

5C + 2SO₂ → CS₂ + 4CO How many moles of carbon are needed to react with 5.44 moles of SO₂?

13.6 mol C

What is the molar mass of (NH₄)₂SO₄?

132.1 g

What is the molar mass of Br₂?

159.8 g

How many liters are there in 7.6 moles of Ar

170 L

How many grams are there in 3.21 x 10²⁴ molecules of H₂O₂?

181 g

How many mL of 0.500 M KCl solution would you need to dilute to make 100 mL of 0.100 M KCl?

20 mL

What is the percent composition of (NH₄)₂C₂O₄

22.6% N 6.5% H 19.4% C 51.6% O

How many grams of NaCl is needed to make a 0.90% m/v solution if the solution volume is 2500 mL

23 g

CO + 2H₂ → CH₃OH Calculate the number of grams of each reactant needed to produce 4.00 x 10²⁴ molecules of CH₃OH.

26.6 g H₂ 186 g CO

5C + 2SO₂ → CS₂ + 4CO How many grams of carbon monoxide form at the same time that 0.246 moles CS₂ forms?

27.6 g CO

Balance the equation and identify the type of reaction. __C₂H₆ + __O₂ → __CO₂ + __H₂O

2C₂H₆ + 7O₂ → 4CO₂ + 6H₂O type: combustion

Complete and balance the equation then identify the type of reaction. __Fe(OH)₃ → _________________________

2Fe(OH)₃ → Fe₂O₃ + 3H₂O type: decomposition

Write a balanced chemical formula when hydrochloric acid reacts with calcium hydroxide to form calcium chloride and water?

2HCl + Ca(OH)₂ → CaCl₂ + 2H₂O

Write a balanced chemical formula when sodium reacts with water to form hydrogen gas and sodium hydroxide?

2Na + 2H₂O → 2NaOH + H₂

Write a balanced chemical formula when lead (IV) oxide decomposes to form lead (II) oxide and oxygen gas?

2PbO₂ → 2PbO + O₂

5C + 2SO₂ → CS₂ + 4CO How many moles of SO₂ are required to make 118 grams of CS₂?

3.10 mol SO₂

How many moles are there in 79.3 L of Cl₂?

3.54 mol

How many liters are there in 44.4 g of C₂H₆?

33.2 L

Write a balanced net ionic equation for AgNO₃(aq)+AlCl₃(aq)→

3AgNO₃(aq) + AlCl₃(aq) → 3AgCl (s) + Al(NO₃)₃(aq) Ag⁺ + Cl⁻ → AgCl(s)

Balance the equation and identify the type of reaction. __Fe + __O₂ → __Fe₃O₄

3Fe + 2O₂ → Fe₃O₄ type: synthesis/combustion

Balance the equation and identify the type of reaction. __Hf + __N₂ → __Hf₃N₄

3Hf + 2N₂ → Hf₃N₄ type: synthesis

CO + 2H₂ → CH₃OH How many L of hydrogen gas are necessary to react with 2.85 grams of CO?

4.56 L H₂

CO + 2H₂ → CH₃OH How many grams of each reactant are needed to produce 360 grams of CH₃OH?

45 g H₂ 320 g CO

What is the percent composition of H₂S

5.9% H 94.1% S

2Al + 3Cl₂ → 2AlCl₃ with 3.00 g Al and 5.3 g Cl₂ Calculate the grams of the product formed.

6.64 g AlCl₃

A compound is formed when 9.03 g Mg combines with 3.48 g N. What is the percent composition of this compound?

72.2% Mg 27.8% N

What is the molar mass of N₂O₃?

76.0 g

What is the molar mass of C₄H₉O₂?

89.0 g

When a 14.2 g sample of mercury(II) oxide is decomposed into its elements by heating, 13.2 g Hg is obtained. What is the percent composition of the compound?

93.0% Hg 7.0% O

What is the molar mass of H₃PO₄?

98.0 g

2Al + 3Cl₂ → 2AlCl₃ with 3.00 g Al and 5.3 g Cl₂ Identify the limiting reactant for the reaction.

Al - limiting reactant

What is the formula for carbon tetrachloride?

CCl₄

Complete and balance the equation then identify the type of reaction. __Ca + __S → _______________________

Ca + S → CaS type: synthesis

What is the formula for dichlorine heptoxide?

Cl₂O₇

Complete and balance the equation then identify the type of reaction. __C₃H₆O + __O₂ → ________________________

C₃H₆O + 4O₂ → 3CO₂ + 3H₂O type: combustion

What is the empirical formula of a compound with 62.1% C, 13.8% H, 24.1% N?

C₃H₈N

What is the empirical formula of a compound with 50.7% C, 4.2% H, 45.1% O, and a molecular weight of 142 g/mol?

C₆H₆O₄

Which compound has the highest percentage of iron? FeCl₂, Fe(C₂H₃O₂)₃, Fe(OH)₂, FeO

FeO

Complete and balance the equation then identify the type of reaction. __HCl + __BaCl₂ → ________________________

HCl + BaCl₂ → No Reaction type: double replacement/NR

What is the formula for chlorous acid?

HClO₂

What is the empirical formula of a compound with 67.6% Hg, 10.8% S, 21.6% O?

HgSO₄

What is the formula for sulfurous acid?

H₂SO₃

What is the formula for sulfuric acid?

H₂SO₄

Balance the equation and identify the type of reaction. __Mg + __ H₂SO4 → __MgSO₄ + __H₂

Mg + H₂SO4 → MgSO₄ + H₂ type: single replacement

Complete and balance the equation then identify the type of reaction. __Mg + __H₂SO₄ → _______________________

Mg + H₂SO₄ → H₂ + MgSO₄ type: single replacement

What is the formula for nitrogen dioxide?

NO₂

What is the formula for dinitrogen monoxide?

N₂O

What is the empirical formula of a compound with 94.1% O, 5.9% H?

OH

What is the molecular formula of a compound with 94.1% O, 5.9% H, and a molecular weight of 34 g/mol?

O₂H₂

What is the formula for phosphorous pentabromide?

PBr₅

Balance the equation and identify the type of reaction. __Pb(NO₃)₂ + __NaI → __PbI₂ + __NaNO₃

Pb(NO₃)₂ + NaI → PbI₂ + NaNO₃ type: double replacement

What is the formula for trisilicon tetranitride?

Si₃N₄

What is the name for Cl₂O?

dichlorine monoxide

What is the name for HCl?

hydrochloric acid

What is the name for HNO₃?

nitric acid

What is the name for NO?

nitrogen monoxide

What is the name for NF₃?

nitrogen trifluoride

What is the name for H₃PO₄?

phosphoric acid

What is the name for SeO₂?

selenium dioxide

What is the name for SiF₄?

silicon tetrafluoride

Name and distinguish between the two components of a solution.

solute- the substance being dissolved; less solvent- the dissolving medium; more

What is the name for S₄N₄?

tetrasulfur tetranitride


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