Chemistry Unit 6
You have 20 g of a buckyball (C20) . How many moles do you have?
0.08 mol
How many moles of nitrogen gas are in a 10.0 L container at STP ?
0.45 moles
Which condition is STP?
0ºC and 1 atm
Which amount has the greatest mass?
1 mole of uranium
For the oxidation of glucose (C6H12O6+6O2→6H2O+6CO2) , how many grams of oxygen gas will be consumed when 950 g of glucose is oxidized completely?
1,013 g
You have 200 g of a substance with a molar mass of 150 g/mol. How many moles of the substance do you have?
1.33 mol
What is the molar mass of calcium carbonate (CaCO3) ?
100 g/mol
You are asked to make 112 g of iron from iron oxide and excess carbon monoxide.Fe2O3(s)+3CO(g)→2Fe(l)+3CO2(g)Approximately how many grams of iron oxide is used?
160 grams
What is the molar mass of ammonia (NH3) ?
17 g/mol
What is the correct ratio of carbon to hydrogen to oxygen in glucose (C6H12O6) ?
1:2:1
Each molecule of hydrogen gas (H2) is made of two hydrogen atoms. You have 6.022×1023 molecules of hydrogen gas. How many moles of hydrogen atoms do you have?
2
A reaction with a percent yield of 45% produces 900 grams of product. What was the theoretical yield?
2,000 grams
How many total atoms are in one mole of ammonia (NH3) ?
2.4 x 10^24
You have 39 g of sodium azide in an air bag [2NaN3(s)→2Na(s)+3N2(g)] . How many liters of nitrogen will it make at STP ?
20.2 L
You collect 44.8 L of ammonia in excess hydrogen (N=14amu,H=1amu) . For the Haber process, N2+3H2→2NH3 , what volume of nitrogen is consumed at STP ?
22.4 L
What is one molar volume of the gas ammonia (NH3) at STP ?
22.4 L/mol
For 2Na(s)+Cl2(g)→2NaCl(s) , how many grams of sodium chloride will be made from 115 g of sodium metal when reacted with excess chlorine gas?
293 g
For the reaction NH4NO3(s)→N2O(g)+2H2O(l) , you decompose 60 g of NH4NO3 and get 11 g of N2O .What is the percent yield?
33%
For the oxidation of glucose (C6H12O6+6O2→6H2O+6CO2) , how many moles of oxygen will it take to consume 6 moles of glucose?
36
For the Haber process, N2+3H2→2NH3 , which mole ratio is used to calculate the yield of ammonia when given hydrogen?
3:2
When calcium carbonate is heated, it breaks down into calcium oxide and carbon dioxide.CaCO3(s)→CaO(s)+CO2(g)You heat 25 g CaCO3 . Approximately what volume of carbon dioxide will you make? Assume the conditions of temperature and pressure are such that 1 mole of any gas will occupy 22.4 L.
5.6 L
What volume does 0.25 moles of oxygen gas occupy at STP ?
5.60 L
When 90 g of water is split by electrolysis (2H2O→2H2+O2) at STP , how many liters of oxygen gas will be collected?
56.0 L
Which value approximately represents the number of atoms in one mole of gold?
6.02 x 10^23
Rasheed calculates that his chemical reaction should produce 4 moles of product, but when he does the experiment, he gets only 3 moles. What is his percent yield?
75%
You have one mole of each of these atoms: carbon-12, oxygen-16, and uranium-235. Which substance has more atoms?
All have the same number of atoms.
Which compound has an element ratio of 1:2:6 ? Ba(NO3)2+Na2SO4→BaSO4+2NaNO3
Ba(NO3)2
You have two containers at 25°C and 1 atm. One has 22.4 L of hydrogen gas, and the other has 22.4 L of oxygen gas. Which statement is true?
Both containers have the same number of molecules.
The chemical standard for the quantity of a mole is based on which substance?
Carbon 12
You want to find the actual amount of reactants that are needed to get a desired amount of product. Which information is required?
Percent yield
What is the branch of chemistry that examines numerical relationships in chemical equations?
Stoichiometry
Which concept accounts for the whole-number subscripts in chemical formulas?
The law of multiple proportions
Which term is not a measure of the quantity of matter?
degrees Celsius
In viewing a chemical equation, how do you determine the ratios that relate reactants and products?
from the coefficients of the reactants and products
What is the measure of the efficiency of a chemical reaction?
percent yield
