I need help with this gas law problem Please!?

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Solid carbon dioxide, called dry ice, is useful in maintaining frozen foods because it vaporizes to CO2(g), rather than melting to a liquid. How many liters of CO2(g), measured at STP, will be produced by the vaporization of a block of dry ice (d= 1.56 g/cm3) that measures 12.0 in x 12.0 in x 2.00 in?
 
First, convert dimensions from inches to cm: 2.00 in x 2.54 cm/in = 5.08 cm

and similarly for the other two measurements.

Multiply together to get volume (cm3)

Volume(cm3) x density (g/cm3) = mass

mass/molar mass = n, number of moles

And now, at last, you can use

PV = nRT (or, if you like, V = 22.4 n L at STP)

to find V

Give answers to 3 sig figs if your instructor is bothered about such things.

Then make sure you understand why each step works, and you will never have difficulty with this kind of problem again.
 
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