Mighty Moles
6.02 x 1023 particles
What is one mole?
The number of sig figs in 3600.
What is 2?
2 Fe + 3 Cl2 --> 2 FeCl3
The mole ratio between iron and chlorine gas.
What is 2/3
A + B --> C
The number of conversion factors necessary to convert from mass A to mass C
3
mass A --> moles A --> moles B -->mass B
Ms. Beamish got the mass of her sample of sodium bicarbonate and then tripped and spilled her sample onto the lab bench. She quickly swept it into her weigh boat and continued with the lab.
Identify the type of error
Human error
Another name for the mole, after the scientist who studied it.
What is Avogadro's number?
The following number in scientific notation 0.000346.
What is 3.46 x 10-4?
The molar mass of calcium hydroxide.
What is 74.10 g/mol?
The number of moles in 127.10g of copper.
What is 2.0000 moles.
Mr. McLeod notices that some of his sample of copper sulfate pentahydrate is still remaining in his weigh boat after transferring it to his beaker. He uses water to rinse out the weigh boat but he is sure that there is still a particle or two of the sample in the weigh boat. He continues on with his lab according to the instructions in the procedure.
Identify the type of error.
What is systematic error?
The mass of 6.02x1023 particles of a substance.
What is molar mass?
The answer to the following addition using correct sig figs:
13.0g + 1001.00g
What is 1014.0g?
Balance the following equation
___Al + ___Fe3O4 ---> ___Al2O3 + ___Fe
What is 8 Al + 3 Fe3O4 ---> 4 Al2O3 + 9 Fe ?
The number of grams of magnesium in 7.00 moles.
What is 170. g?
You boil 100g of copper sulfate pentahydrate, (CuSO45H2O) to remove the water and measure the mass of the remaining copper sulfate (CuSO4). When you turn off the hot plate you notice that the sample still has a slight blue tinge.
Would your actual mass of copper sulfate be higher or lower than the theoretical yield? Explain.
Actual yield would be higher. You are getting the mass of copper sulfate in addition to some water still left in the sample.
(the blue colour represents copper ions that would only be present if there is water present).
Represented by the coefficient in a balanced chemical equation.
What is the number of moles?
The answer to the following calculation using correct sig figs:
12mol x 12.01g/mol
140g (2sig figs)
C5H12 + 8O2 --> 5CO2 + 6H2O
The number of moles of carbon dioxide can I make if I start with 16 moles of oxygen gas.
What is 10. moles?
____Al2O3 --> ____Al + ____ O2
The number of moles of Al2O3 which decompose if 81.0 grams of Al are produced.
What is 1.50mol Al2O3?
4 Fe (s) + 3 O2 (g) --> 2 Fe2O3 (s)
A student performs the reaction listed above and obtains 6.75 g of ferric oxide product. The theoretical yield of ferric oxide calculated to be 7.15 g.
What is the percent yield of the experiment?
What is 94.4% ?
The conversion factor used to convert from moles of one substance to moles of another.
What mole ratio?
The answer to the following calculation using correct sig figs (remember order of operations!):
(4.560x106 ) x (1.4x10-2 )
= 6.4x104
___CH4 + ___O2 --> ___ CO2 + ___H2O
If I want to get 5.3 moles of water, how many moles of methane (CH4) do I need?
What is 2.65 moles of methane?
___H2 + ___ O2 --> ___ H2O
The number of grams of oxygen gas which are needed to produce 10.0 grams of water.
What is 8.89 grams of O2?
Iron (III) phosphate reacts with sodium phosphate according to the following reaction:
2FePO4 + 3Na2SO4 --> Fe2(SO4)3 + 2Na3PO4
What is the percent yield if I perform this reaction with 25.0g of iron (III) phosphate and produce 18.5g of iron (III) sulphate.
What is 56%?