Download Name: Moles Convert 26.33 g Si to moles. Convert 3.00 mol Sn to

Name: _____________________________________________
Moles
1. Convert 26.33 g Si to moles.
2. Convert 3.00 mol Sn to atoms.
3. Convert 7.50 mol SO2 to molecules.
4. Convert 10.5 g NaCl to moles.
5. Convert 8.6 g CO to molecules.
6. If I poured 22.0 g of sugar (C12H22O11) into 33.3 mL of water, we can calculate the concentration of the solution
using a unit called Molarity (M). Molarity stands for moles of solute (substance being dissolved) divided by liters
of solvent (substance doing the dissolving). This tells us how concentrated or dilute a solution is!
7. How many chlorine atoms are there in 410. g of AlCl3?
8. Convert 4.5x1023 atoms of boron to moles of boron.
Review: For more help and example problems, look in your book!
- States of Matter
- Mixtures
- Physical vs. Chemical properties and changes
- Significant Figures (math and measuring)
- Metric Prefixes
- Dimensional Analysis including 1 cm3 = 1 mL
- Moles (know Avogadro’s number)
Some Practice Problems
1. Convert the following (Do you have your metric prefixes memorized?)
1 mile = 5280 ft
1 ft = 12 inches
1 mile = 1610 meters
1 quart = 0.946 liters
A) 39.0 m/sec  miles/hr
B) 4.11 quarts  mL
C) 35 miles  in
D) 22.2 cm = ________ km
E) 0.061 Mm = _______ Gm
F) 0.023 dL =_____μL
G) 0.061 quarts  m3
H) 39,884 cm3 to Mm3
I) 4.50 x 1010 cg to Tg
2. How many sig figs?
104 g_____
104.01 g _____
40 g _____
140.0 g _____ 0.0140 g ____ 5.50x1024 molecules _____
3. Calculations with sig figs: (Do you know the density equation? Remember it makes a heart!)
A) What is the density of an object that has a mass of 1.3 grams and a volume of 14.6 mL?
B) 25.2 mL of water are placed in a graduated cylinder. A 22.6 g stone is dropped in, and the water level rises to
32.4 mL. Find the stone’s density.
C) 2102 x 0.3 =
D) 2102 - 0.3 =
E) (2102 x 0.3) – 111 =
F) How many atoms are contained within 13.2 cm3 of aluminum? The density of aluminum is 2.7 g/cm3?
4. How many grams are in 0.1029 moles of He?
5. What is the mass of 8.4 x 1024 boron atoms?
6. Classify the following as physical (a) or chemical (b) changes.
1) cooking a cake
2) melting ice
3) rusting
7. Classify the following as physical (a) or chemical (b) properties.
1) weighs 10 kg
2) reacts with oxygen
8. Are the following ... ?
a. homogenous mixtures
1) fresh sqeezed orange juice
b. heterogeneous mixtures
2) salt(NaCl)
9. Read the following graduated cylinders
3) sulfur
c. elements
d. compounds
4) a cup of hot tea
1.
2.
3.
4.
Measure the mass of the sample of Silicon (Si). How many Si atoms are in your sample?
How many moles are in the sample of aluminum foil?
Weigh out 0.20 mol of NaCl (salt).
I placed ______g of sugar in ______mL of water. What is the concentration of the solution? This is measured in
Molarity (M).
5. How many sugar (C12H22O11) cubes do you need for a TOTAL of 0.0500 moles?
6. What is the mass of one sugar molecule? How many sugar molecules are in a sugar cube?