Dimensional Analysis
How many hydrogen atoms are in 135g of H2O (molar mass = 18.015 g/mol)
9.02x1024 atoms
calcium floride
CaF2
How many sig figs?
0.000100
3
You are in Canada driving on the highway and the speed limit reads 120 km/hour. Your car is in miles/hour what is the speed limit in miles per hour?
1 km = 0.6214 miles
75 mi/hour
__CH4 + __O2 → __CO2 + __H2O
44.0 g of CH4 are reacted with 39.5 g of O2 to form 14.3 g of H2O
Balance reaction and what is percent yield?
64.6%
what is the mass of 25.0 mL octane
(density = 0.702 g/cm3)
1 cm3 = 1 mL
17.55 g
CoN
cobalt (III) nitride
How many sig figs?
100,000.0
7
How many nanogram are in 5.27x10-13
.527 nanogram
__C2H6 + __O2 → __H2O + __CO2
16.7 g of C2H6 are reacted with 29.2 g of O2 to form 19.9 g of CO2
Balance reaction and what is percent yield?
86.9%
How many nanoliters are there in 3.57x104 mg of CH3OH (density = 0.695 g/mL)
5.1x10-8
name these polyatomic ions:
NO2-, SO42-, and NH4+
nitrite, sulfate, ammonium
How many sig figs?
00204.0
4
What is the mass of 2.4 x 1023 molecules of NO2 (molar mass = 46.0055 g/mol)
18 g
__N2 + __H2 → __NH3
9.30 g of N2 are reacted with 12.4 g of H2 to form 5.08 g of NH3
Balance reaction and what is percent yield?
45.0%
The volume of a container holds 5.7 L of water. What is this volume in cm3?
1 inch = 2.54 cm
1 cm3 = 1 mL
347.6 cm3
(NH4)2PO4
ammonium phosphate
What is the correct answer for the addition 102.5 mL + 6.55 mL
109.0 mL
A loaf of bread has a mass of 24 ounces what is this in kg?
16 ounces = 453.6 g
.68 kg
__Na + __H2O → __NaOH + __H2
86.9 g of Na are reacted with 91.2 g of H2O to form 121 g of NaOH
Balance reaction and what is percent yield?
80.0%
A box has a volume of 4.75x1018 μm3. What is the volume of the box in cubic feet.
2.54 cm = 1.00 inch
12 inches = 1.00 foot
168 ft3
zinc (III) nitrate
Zn(NO3)3
What is the correct answer to the following mathematical operation expressed to the appropriate number of significant figures?
.040__________________
(2.6345x10-4) x (7.91)
19
A pump for a small swimming pool will circulate 3.77x102 gallons/hour through the filter. If the pool contains 6.85x105 ounces of water, how many seconds will it take to filter the entire contents of the pool?
4.00 quarts = 1.00 gallon
1.00 quart = 32.0 ounces
5.11 x 104 seconds.
__Sc2O3 + __SO3 → __Sc2(SO4)3
18.6 g of Sc2O3 are reacted with 21.3 g of SO3 to form 29.0 g of Sc2(SO4)3
Balance reaction and what is percent yield?
86.3%