Chemistry test
For the reaction represented by 2Na + 2H2O --->2NaOH +H2, how many grams of sodium hydroxide are produced from 3.0 mols of sodium with excess of water?
120 g
For the reaction represented by the equation 2H2 + O2 -> 2H2O, how many moles of water can be produced from 6.0 mol of oxygen?
180 g
For the reaction represented by the equation Cl2+2KBr→2KCl+Br2, how many grams of potassium chloride can be produced from 300. g each of chlorine and potassium bromide?
188 g
In the reaction represented by the equation N2+3H2--> 2NH3, what is the mole ratio of nitrogen to ammonia
1:2
What mass of ozone will form from the reaction of 2.0 g of NO2 in a car's exhaust and excess oxygen?
2.1 g
The Haber process for producing ammonia commercially is represented by the equation N2(g) + 3H2(g) → 2NH3(g). To completely convert 9.0 mol hydrogen gas to ammonia gas, how many moles of nitrogen gas are required?
3.0 mol
What is the total number of molecules that is represented by the following chemical equation NH4NO2--->N2 +2H2O
4
In the equation 2KClO3 -> 2KCl + 3O2, how many moles of oxygen are produced when 3.0 mol of KClO3 decomposes completely?
4.5 mol
How many OH- ions are present in 3.00 mol of Ca(OH)2?
6.00
For the reaction represented by the equation CH4 + 2O2→ CO2 + 2H2O, how many moles of carbon dioxide are produced from the combustion of 100? g of methane?
6.23 mol
The molar mass of CCl4 is 153.81 g/mol. How many grams of CCl4 are needed to have 5.000 mol?
769.0g
If the percentage yield for the reaction represented by the following equation is calculated to be 60.0%, what mass of Al is expected from the reaction of 51.0g of Al203? 2Al203--->3Al+3O2
90 g
For the reaction so3 + h2o h2so4, calculate the percent yield if 500. g of sulfur trioxide react with excess water to produce 575 g of sulfuric acid.
93.9
what is the measured amount of a product obtained from a chemical reaction?
actual yield
To balance a chemical equation, it may be necessary to adjust the
coefficients
the units of molar mass are
g/mol
a chemical reaction involving substances A and B stops when B is completely used. B is the
limiting reactant
to balance a chemical equation allows one to determine the
moles ratio of any two substances in the reaction
You mix solution A with solution B in a beaker. Which of the following observations does not help you prove that a chemical reaction has occurred?
none of the above, all help prove that a chemical reaction has occurred
What is the ratio of the actual yield to the theoretical yield, multiplied by 100%?
percentage yield
The coefficients in a chemical equation represent the
relative numbers of moles of reactants and products
A chemical equation is balanced when the
same number of each kind of atom appears in the reactants and in the products
For the reaction represented by the equation Pb(NO3)2 + 2KI → PbI2 + 2KNO3, how many moles of lead(II) iodide are produced from 300. g of potassium iodide and an excess of Pb(NO3)2?
0.904 mol