## CHEM 1001/CHM1020/CHM1025C/CHM1032C Module 2 Part F Unit Analysis Problems 10pts

You may use a calculator. Please use the Unit Analysis or Dimensional Analysis method to solve ONLY TWO of the following word problems:

1. An oxygen molecule travels 975 mi/hr at room temperature. There are 5280 ft = 1 mi; 12 in = 1 ft, 2.54 cm = 1 in, 1.621 km = 1 mi, and 3600 sec = 1 hr. What is the velocity in meters per second?

### The Question:

____???____ m/sec = 975 mi/hr

### Given Unit Factors

• 5280 ft = 1 mi
• 12 in = 1 ft
• 2.54 cm = 1 in
• 1.621 km = 1 mi
• 3600 sec = 1 hr

2. If one gram is equal to 15.4 grains. How many 5.00 grain aspirin tablets may be made from 1.00 kilogram of aspirin?

### The Question:

____???_____ tab = 1.00 kg

### Given Unit Factors

• 1 g = 15.4 grain
• 1 tab = 5.00 grain

3. A parsec is the distance light travels in 3.26 years. Given the velocity of light, 3.00 x 108 m/sec, how many kilometers does light travel in one parsec?

### The Question:

____???_____ km = 1 parsec

### Given Unit Factors

• 1 parsec = 3.26 yr
• 3.00 x 108 m = 1 sec

4. I have 1400 radio programs I want to put on an Apple Ipod. Each program requires 5 megabytes of disk space. If there are 1024 megabytes in a gigabyte. How many gigabytes of disk space do I need minimum to store all my programs on the IPod. The Mini-Ipod holds only 4 gigabytes of recordings, could I use a mini for my project?

____???_____ Gb = 1400 programs

### Given Unit Factors

• 1 program = 5 Mb
• 1024 Mb = 1 Gb