When calculating molar mass how do I know how many digits to record?
What is all of the digits?
100
To find you an empirical formula, you first convert the percent to ______________.
What is grams.
100
The first step in percent composition is to find the _________________.
What is molar mass.
100
What fraction will you use to convert from moles to particles?
What is 6.02*10^23 particles/ 1 mole.
100
When doing conversions, what number do you always write out first?
What is the number given in the problem?
200
What is the molar mass of MgO?
What is 40.31 g.
200
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.
200
What am I going to divide each individual total by in the problem NaOH?
What is 39.9971 grams.
200
The mole refers to the _________________ of a substance.
What is the amount.
200
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?
300
What is the molar mass of H2O?
What is 18.02 g.
300
When you have whole numbers for each element what is the last step?
What is plug the subscripts into your formula.
300
When I have parentheses in my compound, what do I do with the subscript on the outside?
What is multiply by the inside subscripts.
300
What is the only conversions I need to calculate the molar mass for?
What is moles to mass or mass to moles.
300
How many atoms are in 4.65 grams of H2?
What is 1.39*10^24 atoms.
400
What is the molar mass of Be(NO2)2?
What is 101.03 g.
400
What is the empirical formula for each of the following molecular formulas:
C2H4
C6H12O6
C3H12O9
What is
CH2
CH2O
CH4O3
400
What is the percent composition of hydrogen in the compound H2O?
What is 11.2%.
400
How many moles are in 2 x 10^25 atoms of Water?
What is 30 moles.
400
How many grams of AlN are in 3.21 x 10^18 particles?
What is 0.000219 grams./2.19*10^-4 grams
500
What is the molar mass of Mg3(PO3)2?
What is 230.87 g.
500
What is the molecular formula for a compound with empirical formula CH4O3 and molecular molar mass of 192.122 grams?
What is C3H12O9.
500
What is the percent composition of the Calcium in the compound Ca(NO3)2?