What is the percent composition of the following compounds?
A sample is found to contain 40.7g of carbon, 12.3g of hydrogen, and 16.9g of oxygen.
MgSO4
What is the empirical formula for the following? (This is not a problem, just reduce the subscripts if possible)
C12H22O11
H2O2
P4O10
Calculate the empirical formula for the following compounds:
75% C and 25% H
40.92% C, 4.58% H, and 54.50% O
Calculate the molecular formula for a compound with an
empirical formula of CH2 and a molar mass of 70 g/mol.
*Chapter 11:
Balance the following equations.
___ PbO2 ___ PbO + ___ O2
___ Fe(OH)3 ___ Fe2O3 + ___ H2O
___ (NH4)2CO3 ___ NH3 + ___ H2O + ___ CO2
___ NaCl + ___ H2SO4 ___ Na2SO4 + ___ HCl
___ C6H6 + ___ O2 ___ CO2 + ___ H2O
___ Ca3P2 + ___ H2O ___ Ca(OH)2 + ___ PH3
___ SrBr2 + ___ (NH4)2CO3 ___ SrCO3 + ___ NH4Br
Write the type of each reaction and predict the products. Be sure to balance the equation. (Hint: Zinc has a +2 charge.)
___ Zn + ___ AgNO3
___ Mg + ___ O2
___ C2H6 + ___ O2
___ H2C2O4 + ___ KOH
___ Ag2O
*Chapter 12:
What is conserved in a chemical reaction? (List 2)
What unit should you think of when using coefficients?
How many moles of oxygen are needed to make 14.7 moles of water?
C2H4 + 3O2 2CO2 + 2H2O
How many moles of carbon dioxide are produced from 20.3 moles of C2H4?
C
2H4 + 3O2 2CO2 + 2H2O
What are the 3 steps to a stoichiometry problem?
What are the 3 conversion factors for a mole?
How many grams of iodine are produced from 68.7L of carbon monoxide?
I2O5 + 5CO 5CO2 + I2
How many molecules of I2O5 are required to produce 3.41 mol of carbon dioxide?
I2O5 + 5CO 5CO2 + I2
If you start with 50g of copper (II) chloride and 50g of sodium nitrate, then how many moles of copper (II) nitrate will be produced? Identify the limiting and excess reagents.
CuCl2 + 2NaNO3 Cu(NO3)2 + 2NaCl
A student reacts 1.3 mol of silver with 3.7 mol of sulfur, how many moles of silver (I) sulfide will be produced? Identify the limiting and excess reagents.
2Ag + S Ag2S
When 50g of chlorine reacts with potassium, 1.15 mol of potassium chloride is produced. What is the percent yield of the reaction?
2K + Cl2 2KCl
When 275g of sodium chlorate decomposes, 80.11L of oxygen is produced. What is the percent yield of the reaction?
2NaClO3 2NaCl + 3O2