ANSWER KEY to Chemistry: Dimensional Analysis – More Practice Problems
7.
1.
1600 m
2.
1000mm
1m
1m
1000 mm
150 mg
= 1,600,000 mm or
= 1.6 x 106 mm
Determine the number of m in 1600 mm.
1600 mm
3.
Convert 150 mg of acetylsalicylic acid (aspirin) to
g of aspirin.
Determine the number of mm in 1600 m.
8.
Convert 2500 mL of hydrochloric acid (HCl) to L
of HCl.
= 1.6 m
2500 mL
9.
1L
1000 mL
= 2.5 L
10 mm
1 cm
Convert 0.020 kg of tin (Sn) to mg of Sn.
= 143 mm
0.020 kg
10.
1000 mg
1 kg
1g
= 20, 000 mg
Convert 2875 cm3 to liters.
2875 cm3
= 52 mm
1000 g
= 2.875 L
1 mL
1L
1 cm3
1000 mL
Convert 0.049 kg sulfur (S) to g of S.
0.049 kg
6.
10 mm
1 cm
Convert 5.2 cm of magnesium (Mg) ribbon to
mm of Mg ribbon.
5.2 cm
5.
= 0.150 mm
Determine the number of mm in 14.3 cm.
14.3 cm
4.
1g
1000 mg
1000 g
1 kg
11.
= 49 g
11.34 g
L
Convert 150 cm of copper (Cu) wire into mm of
Cu wire.
150 cm
13.
12.
1L
1000 mL
365.25 days
1 yr
0.5 g
24 hrs
1 day
60 min
1 hr
1 kg
1000 g
60 sec
1 min
= 0.325 kg + 2.5 kg =
1 kg
1000 g
= 0.0005 kg or 5
x 10-4 kg
= 135697680 sec
= 140000000 sec
or 1.4 x 108 kg
= 2.8 kg
(notice sig figs!)
How many mL of water (H2O) will it take to fill a 2.0 L bottle that already contains 1.87 L of H2O?
2.0 L – 1.87 L = 0.13 L
Note: technically, you should round the 0.13 L to 0.1 L…
because of sig figs… which then makes the next
calculation = 100 mL.
=
0.00001134
kg/L or
1.134 x 10-5
kg/L
Convert 0.5 g of sodium (Na) to kg of Na.
A metallurgist is making an alloy that consists of 325 g of chromium (Cr) and 2.5 kg of iron (Fe).
Find the total mass of the mixture in kg.
325 g
15.
= 1500 mm
1 kg
1000 g
How many seconds are in 4.3 years?
4.3 yrs
14.
10 mm
1 cm
The density of lead (Pb) is 11.34 g/mL.
Find the density of Pb in kg/L.
0.13 L
1000 mL
1L
= 130 mL