# Expressing answers answers for numbers and unites.

Sun44

""""
a) The price of gold, according to << Link removed by Moderator >>is currently $27 per gram. It is estimated that over the course of history about 170,000 tonnes of gold has been mined, what would the current price of all this gold be? b) The density of gold is 19.3 g cm^-3. Express it in units of kgm^-3. """ ## Homework Equations Not sure ## The Attempt at a Solution a) 4.59 x 10^12 (3 SF) Last edited by a moderator: ## Answers and Replies Staff Emeritus Science Advisor Homework Helper ## Homework Statement """" a) The price of gold, according to << Link removed by Moderator >>is currently$27 per gram. It is
estimated that over the course of history about 170,000 tonnes of gold has been mined,
what would the current price of all this gold be?
b) The density of gold is 19.3 g cm^-3. Express it in units of kgm^-3. """

Not sure

## The Attempt at a Solution

a) 4.59 x 10^12 (3 SF)
Use the factor label method.

$$\frac{19.3 \ g}{cm^3} \cdot \frac{\text{ ??? } kg}{\text{ ??? } g} \cdot \frac{\text{ ??? }}{\text{ ??? }} = \text{The Answer}$$

You'll have to figure out what goes in place of all the "???". That is, how do you convert between g and kg? Also, how do you get the cm3 to become m3?