Posted by **Anonymous** on Wednesday, September 12, 2012 at 1:00pm.

Any help is appreciated!

Gold has a density of 19.3 g/cm3. Do you think you could carry 2.40 cubic ft (rhetorical--don't answer)? How many pounds does 2.40 cubic feet of gold weigh? [453.6 g = 1 lb, 2.54 cm = 1 in, and 1 ft = 12 in.]

7.42e-2

A scientific oven is programmed to change temperature from 51.4 ºF to 207.4 ºF in 1.50 minute(s). Express the rate of change in degrees Celsius per second.

-1.16

A bug is observed to travel 72 cm in 7.5 seconds. What is the bug's speed in miles per hour?

.21

Thank you!

- Chem -
**DrBob222**, Wednesday, September 12, 2012 at 1:43pm
a isn't even close. Show your work and I'll find the error.

b is close but I obtained 1.7 or thereabouts.

c. 0.214 is the factor for cm/sec to mph. You still must multiply by cm/sec which is 72/7.5.

- Chem -
**L**, Wednesday, September 12, 2012 at 1:50pm
thanks! all i did for a was change 2.4 by converting it in the manner they said, from feet to inches, inches to centimeters. same with 19.3. i changes it from grams to pounds.

- Chem -
**Steve**, Wednesday, September 12, 2012 at 1:57pm
something tells me you divided instead uf multiplying somewhere. In problems like this, be sure to keep track of the units, so you cancel out the ones you don't want.

As for you answer of .00742 lbs, even a cursory sanity check would give a clue that it's bogus. Gold is heavy. Could you lift a cubic foot of it? I doubt it. So, on to the calculations. You want to convert ft^3 to lbs, knowing the various equivalents.

2.4 ft^3 * 12^3 in^3/ft^3 * 2.54^3cm^3/in^3 * 19.3g/cm^3 * 1lb/453.6g = 2892 lbs

- Chem -
**L**, Wednesday, September 12, 2012 at 2:02pm
Great! Thank you!

- Chem -
**Steve**, Wednesday, September 12, 2012 at 2:12pm
Hey, no problem. It was a real epiphany for me when I took physics, when I found out that units could be canceled just like numeric factors.

## Answer this Question

## Related Questions

- chemistry - Gold has a density of 19.3 g/cm3. Do you think you could carry 1.30 ...
- physics - can some one explain this Assuming a gram of gold costs approximately...
- chem - How many pounds does 40.9 in3 of gold weigh? (The density of gold is 19.3...
- physical sciences - If 57.9 grams of gold has a volume of 3 cubic centimeters ...
- chemistry - silver has density of 10.5 g/cm3 and gold has a density of 193.g/cm3...
- Chemistry - The coinage metals -- copper, silver, and gold -- crystallize in a ...
- math - A samll bar of gold measures 40 mm by 25 mm by 2 mm. One cubic millimeter...
- Chem - Pure gold adopts a face-centered cubic crystal structure. It also has a ...
- Chemistry - Earth's oceans have an average depth of 3800 m, a total area of 3.63...
- Math - If 241.5 grams of gold has a volume of 12.5 cubic centimeters, what is ...

More Related Questions