Hnrs Chem. Sem. 1
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
