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.
What is 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 grams of H(1.0079), and 15 grams O2(31.9988). (HINT: How many moles of HO2 would each make)
H+O2= HO2
What is O2.
There are 2.10 Mols of H in total and you need .59 Mols of H to be used in your experiment. How much of your excess reactant is left. Answer in Mols.
What is 1.51 Mols 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 g sample of ammonia(17.0305) is mixed with 4.00 g of oxygen(31.9988). 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 Oxygen. (makes .100 moles of NH3)
There are 5.00 Mols of O2(31.9988) and only 3.00 Mols O2 were needed.
How much of your excess reactant is left? Answer in grams.
What is 95.994 g O2.
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!
80g of Cu(63.546) and 50g of O2(31.9988). which is the limiting reactant? How many moles of CuO will each make reactant?
2Cu+O2=2CuO
What is copper. Copper makes 1.3 moles of CuO
Oxygen will make 3.1 moles of CuO
2.00 g sample of ammonia(17.0305) is mixed with 4.00 g of oxygen(31.9988). Which is the excess reactant? (HINT: Find how many moles of NO both reactants make)
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(119.378) and 25 grams of chlorine(70.906) were mixed. Which is the limiting reactant? How many grams of CCl4(153.8228) will each make? How much is left over of the limiting reactant?
CHCl3 = chloroform
CHCl3 + Cl2 = CCl4 + HCl
What is Chloroform. (Zero is left over)
Chloroform makes 32 g CCl4
Chlorine makes 54 g CCl4
In an experiment 50 grams of chloroform(119.378) and 25 grams of chlorine(70.906) were mixed. Which is the excess reactant? (HINT: Find how many moles of CCl4 each reactant make)
CHCl3(Chloroform) + Cl2 = CCl4 + HCl
What is Chloroform.
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