Find the final volume of water when solid is added to graduated cylinder

the density of pure silver pellets is 10.5 g/cm^3. if 5.25g of pure silver pellets is added to gradulated cylinder containing 11.2 mL of water, to what volume level will the water in the cylinder rise? 

Find the volume of the silver pellets from mass of silver/density of silver. Add this to the volume of water in the cylinder to get the new volume

i got 11.7 mL for the new volume. i did v=m/d or v=5.25g/10.5g/cm^3 and i got .5 cm^3 but then how do i cancel out the cm^3 to add the 11.2 L and .5?

 

 i have another question that i'm confused of is 2.0800 has 5 significant digits. am i right? what about  480? how many significant digits? 

 

 

 

can you help me with this problem:
The density of a particular brand of gasoline (a mixture) at room temperature is 0.70 g/mL.  If the gas tank of a car holds 10.0 gallons (conversion factor: 3.7854 L/gallon), what is the mass of a tankful of gasoline? 
 

" i have another question that i'm confused of is 2.0800 has 5 significant digits. am i right? what about  480? how many significant digits? "

 

Correct there are 5. However, 480 only has 2. There are different rules for zeros after a decimal and before a decimal.

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