## PreTest: Steps 1 and 2 Answers: Name:
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## 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:

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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 10**^{8} 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 10
^{8} 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

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Analysis Main Menu