Definitions
Limits the extent of a reaction, thus it determines the amount of a product that can be made.
What is Limiting Reactant.
Which is the limiting reactant if you have 8 cheese slices, 6 bread slices, and 10 ham slices?
(Recipe Calls for 2 slices of bread, 1 slice of cheese, 2 slices of ham)
What is bread slices.
True or false. The excess reactant limits how much of a product will be formed in a reaction.
false.
Molar mass is used when doing mole ratios in stoichiometry problems? T or F
FALSE (Moles to Grams or Grams to moles )
Which is the limiting reactant if you have 10 moles of H2, and 15 moles O2. (HINT: How many moles of H2O would each make)
2H2 + O2 -> 2H2O
What is H2.
There are 2.10 mol of H in total and you need .59 mol of H to be used in your experiment. How much of your excess reactant is left. Answer in Mols.
What is 1.51 mol of H left.
Coefficients and subscripts are used when calculating molar mass. T OR F EXAMPLE: 2NO3
FALSE ( ONLY SUBSCRIPTS)
Limiting reactant problems will always give you the ________ ________ of your reactants in the question asked.
Starting amounts
2.00 mol sample of ammonia(NH3) is mixed with 4.00 mol of oxygen (O2). Which is the limiting reactant? (HINT: HOW many moles of NO would each make?)
4 NH3(g) + 5 O2(g) -> 4 NO(g) + 6 H2O(g)
What is ammonia (NH3).
Which is the excess reactant if you have 9.5 moles of H2, and 4.7 moles O2. (HINT: How many moles of H2O would each make)
2H2 + O2 -> 2H2O
What is H2.
Molar Mass has the units of G/MOL but we only use g in our dimensional analysis because it is in fraction form.
TRUE ( # GRAMS / 1 MOLE ) or ( 1 mole / # grams )
How much is left over of your limiting reactant at the end of a reaction?
NONE!!! ZERO!
3 moles of Cu and 50g of O2(32 g/mol). which is the limiting reactant? How many moles of CuO will each reactant make?
2Cu+O2=2CuO
What is copper. Copper makes 3 moles of CuO
Oxygen will make 3.1 moles of CuO
2.00 g sample of ammonia(17 g/mol) is mixed with 4.00 g of oxygen(32 g/mol). Which is the excess reactant?
4 NH3(g) + 5 O2(g) -> 4 NO(g) + 6 H2O(g)
What is ammonia.
Calculate the molar mass of Fe(NO3)2
179.87 g/mol
What do limiting reactant problems help scientist calculate?
The actual amount of product that was produced in a reaction.
In an experiment 25 grams of chloroform (120 g/mol) and 25 grams of chlorine (71 g/mol) were mixed. Which is the limiting reactant?
CHCl3 = chloroform
CHCl3 + Cl2 -> CCl4 + HCl
What is Chloroform (CHCl3).
In an experiment 50 grams of chloroform(120 g/mol) and 25 grams of chlorine(71 g/mol) were mixed. Which is the excess reactant?
CHCl3(Chloroform) + Cl2 -> CCl4 + HCl
What is chloroform CHCl3.
Which Molar Mass is incorrect? and what is the correct molar mass?
NaCl : 58.44 g/mol
Al2O3 : 128.94 g/mol
KNO3 : 101.11
Al2O3 = 101.96 g/mol