Molar Mass
Formulas
Percent Composition
Single Step Conversions
Multistep Conversions
200
When calculating molar mass how do I know how many digits to record?
What is all of the digits?
200
To find you an empirical formula, you first convert the percent to ______________.
What is grams.
200
The first step in percent composition is to find the _________________.
What is molar mass.
200
What fraction will you use to convert from moles to particles?
What is 6.02*10^23 particles/ 1 mole.
200
When doing conversions, what number do you always write out first?
What is the number given in the problem?
400
What is the molar mass of MgO?
What is 40.31 g.
400
If you are not at whole numbers after dividing each by the lowest number of moles you have to ____________ by the lowest number possible to get whole numbers.
What is multiply.
400
What am I going to divide each individual total by in the problem NaOH?
What is 39.9971 grams.
400
The mole refers to the _________________ of a substance.
What is the amount.
400
When doing multistep conversions what two fractions do you use when going from particles to grams?
What is 1 mole/6.02 x 10^23 and molar mass/1 mole?
600
What is the molar mass of H2O?
What is 18.02 g.
600
When you have whole numbers for each element what is the last step?
What is plug the subscripts into your formula.
600

*** DAILY DOUBLE ***

When I have parentheses in my compound, what do I do with the subscript on the outside?

What is multiply by the inside subscripts.

600
What is the only conversions I need to calculate the molar mass for?
What is moles to mass or mass to moles.
600
How many atoms are in 4.65 grams of H2?
What is 1.39*10^24 atoms.
800
What is the molar mass of Be(NO2)2?
What is 101.03 g.
800

*** DAILY DOUBLE ***

What is the empirical formula for each of the following molecular formulas: C2H4 C6H12O6 C3H12O9

What is CH2 CH2O CH4O3

800
What is the percent composition of hydrogen in the compound H2O?
What is 11.2%.
800
How many moles are in 2 x 10^25 atoms of Water?
What is 30 moles.
800
How many grams of AlN are in 3.21 x 10^18 particles?
What is 0.000219 grams./2.19*10^-4 grams
1000
What is the molar mass of Mg3(PO3)2?
What is 230.87 g.
1000
What is the molecular formula for a compound with empirical formula CH4O3 and molecular molar mass of 192.122 grams?
What is C3H12O9.
1000
What is the percent composition of the Calcium in the compound Ca(NO3)2?
What is 24.4%.
1000
How many moles are in 5.860 grams of water?
What is 0.3252 moles.
1000
How many particles are in 34.5 grams of Na2S?
What is 2.66 x 10^23 particles.
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