Chem Calculations CP Jeopardy

1

100

what is molar mass

the mass of 6.02 x 10^23 atoms of that substance

200

What is the molar mass of MgO?

What is 40.31 g.

300

What is the molar mass of H₂O?

What is 18.02 g.

400

What is the molar mass of Be(NO₂)₂?

What is 101.03 g.

500

What is the molar mass of Mg₃(PO₃)₂?

What is 230.87 g.

2

100

To find you an empirical formula, you first convert the percent to ______________.

What is grams.

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.

300

What is the empirical formula for each of the following molecular formulas: 1. C₂H₄  2. C₆H₁₂O₆  3.  C₃H₁₂O₉

What is CH₂  CH₂O  CH₄O₃

400

What is the empirical formula of a compound that contains 49.32% C, 6.85% H, and 43.84% O.

C₃H₅O₂

500

What is the molecular formula for a compound with empirical formula CH₄O₃ and molecular molar mass of 192.122 grams?

What is C₃H₁₂O_9.

3

100

The first step in percent composition is to find the _________________.

What is molar mass.

200

When finding the percent composition of NaOH, what number am I going to divide each of the molar masses by?

What is 39.9971 grams.

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.

400

What is the percent composition of hydrogen in the compound H₂O?

What is 11.2%.

500

What is the percent composition of the Calcium in the compound Ca(NO₃)₂?

What is 24.4%.

4

100

What fraction will you use to convert from moles to particles?

What is 6.02*10^23 particles/ 1 mole.

200

What is avogadros number? and what is the definition

What is the the number of molecules in one mole of anything.

300

How many moles are in 250 g of NaCl

4.27 mol

400

How many moles are in 2 x 10^25 atoms of Water?

What is 30 moles.

500

How many moles are in 5.860 grams of water?

What is 0.3252 moles.

5

100

When doing conversions, what number do you always write out first?

What is the number given in the problem?

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

How many atoms are in 4.65 grams of H2?

What is 1.39*10^24 atoms.

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

How many particles are in 34.5 grams of Na₂S?

What is 2.66 x 10^23 particles.