Explain how to convert from moles to grams and grams to moles of the same substance
What is multiply or divide by the molar mass of the substance?
100
What is the percent composition of C in CH2?
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What is 85.6 % C?
100
What are the 4 STEPS to writing an EMPIRICAL FORMULA?
What is
1) Change % to grams.
2) Convert grams to moles using your T-CHART
3) Divide by the SMALLEST MOLE NUMBER
4) If not a whole number, MULTIPLY to get a whole #.
100
Determine the mole ratio for HgCl2 and AlCl3:
2AlI3 + 3HgCl2 --> 2AlCl3 + 3HgI2
What is 3/2 or 2/3?
200
If you are looking for GRAMS in a MOLAR MASS problem, which way do the units go in the T-chart?
What is _____ grams/1 mole?
200
number of moles in 45 grams of HF
What is 2.25 moles?
200
What is the Percent Composition of Oxygen in CH2O?
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What is 53.28 % O?
200
Sometimes we get 1/2, 1/3 and 1/4 when completing our steps for writing an EMPIRICAL FORMULA, what do we multiply by for 1/2, 1/3 and 1/4 to get a WHOLE number?
What is 2, 3 and 4?
200
How many moles of NH3 are produced when 7.45 moles of N2 are used
N2 + 3H2 --> 2NH3
What is 14.9 moles NH3?
300
If you are looking for MOLES in a MOLAR MASS problem, which way do the units go in a T-CHART
What is 1 mole/____ grams?
300
Number of moles in 456 g of Ra(OH)2
What is 1.75 moles?
300
What is the PERCENT COMPOSITION of S & O in SO3?
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What is 40.05 % S and What is 59.95% O?
300
Find the Empirical Formula of 8 % C and 2 % H?
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What is CH3?
300
What mass of CO2 is produced when 6.2 moles of C3H8 is used
C3H8 + 5 O2 --> 3 CO2 + 4 H2O
What is 818.2 grams of CO2?
400
Molar mass of Barium Chloride
What is 208.23 grams?
400
Number of grams in 1.47 moles NaHCO3
What is 123.44 grams?
400
What is the PERCENT COMPOSITION of O in H3PO4?
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What is 65.32 % O?
400
Given the EMPIRICAL FORMULA of C4H2O, what is the molecular formula given the molecular mass of 324 grams.
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What is C20 H10 O5
400
What mass of of NaI will react with 7.82 grams of Cl2?
What is 33.06 g of NaI?
500
Molar mass of ammonium hydroxide
What is 35 g?
500
Number of grams in .568 moles of Pb(CH3COO)4
What is 25.73 grams?
500
What is the PERCENT COMPOSITION of Cr and O in Cr2O7?
What is 48.15 % Cr and What is 51.85 % O?
500
Given the EMPIRICAL FORMULA of P2S5, what is the molecular formula given a molecular mass of 422 grams?
What is P4 S10?
500
Li3N + 3 H20 ------ NH3 + 3 LiOH
Given the BALANCED EQUATION above, what MASS (grams) of LiOH is needed to react with 120 g of NH3?
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