Vocabulary
Significant Figures
Molar Mass & Percent Composition
1 step mole conversions
Sci. Notation and 2-step mole conversion
100

6.02 x 1023, Avogadro's number

What is the number of particles in the mole?
100

1989 Taylor's Version

What is 4 sig figs?
100

Molar Mass: MgBr2

Show work

184.11 grams/mole or 184 g/mol

100
The amount of moles in 1.2 x 1024 atoms of Na. 

2 moles of Na

100

One step problem with sci. notation:

Quinn has 3.5 moles of gold. How many atoms are present?

2.1 x 1024 atoms

200

The mass in grams of one mole of a substance.

What is Molar Mass?

200

Roger and Anita end of up 101 dalmations. 

What is 3 sig figs?

200

Molar mass of Ca(NO3)2

Show work

164.01 g/mol or 164 g/mol

200

At STP, 3.75 moles of gas are found. What is the volume in liters that is occupied?

84.0 L 

200

Eric wrote 20.1 x 10-8 molecules are present in a sample of water. What is wrong with this reporting?

Coefficient needs to be between 1 and 9.999.
300
This is found by taking the contribution of the element in a compound and dividing by the total mass of compound.
What is percent composition?
300

0.01 grams of excrement per pound of coffee beans is FDA regulation. 

What is 1 significant figure?

300

What is the percentage of oxygen in CO2?

Show work!

72.7%

300

Diatomic oxygen gas is found to occupy 60.0 L. How many moles of O2?

2.68 moles of O2

300

A room holds nearly 120,040 L of N2 gas at STP. What is the mass in grams of this sample?

150,050 grams of N2

120,040 (1mol/22.4L)(28 g/1 mol)

400

A way of expressing too large or too small numbers by using a coeffiencent between 1-9.99 x 10n. Where n is an interger. 

What is scientific notation?
400

Made famous by the musical Rent's "Seasons of Love"- 525,600 minutes is length of a year. 

What is the 4 significant figures?

400

What is the percent composition of acetone, C3H6O?

C=62%

H= 10%

O = 28%

400

Eleanor has 5,470 grams of NaCl (sodium chloride). How many moles of NaCl are in the sample?
show work

94.3 g/mol or 92.7 g/mol ** depends on how your rounded Cl**

400

Bri and Libby have 3 balloons of helium that have a total volume of 9.67 L at STP. What is the total mass in grams of the helium (He) in the balloons?

1.73 grams

9.67 L (1 mol/22.4L) (4 g/1 mol) =

500

The space occupied by the gaseous particles at standard temperature and pressure conditions.

What is molar volume?

500

Round the value of $99,794.25 to 1 significant figure without losing value. 

What is $100,000?

500

Rank highest to lowest the following compounds by percent composition of oxygen: CO, H2O, or C6H12O6?

H2O (89%), CO (57%), C6H12O6 (53%)

500
Scottie has 0.73 moles of aluminum hydroxide, Al(OH)3. What is the mass in MILLIGRAMS?

57,000 mg (sig figs)

500

How many molecules of water are present in a 8 oz of water (approximate mass is 226.8 grams)?
1 mole = 18 g
1 mole = (6.02 x 1023 molecules)

7.585 x 1024 molecules 

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