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Question

The initial volume and pressure of a gas is 90.5 kPa and 4.56 L. If the conditions change so the gas now has a 
pressure of 780 torr, a volume of 6.54 L and a temperature of 198°C, what was the initial temperature?

Jim · Answer

PV=nRT <<<memorize!!
n is moles, R is gas constant (use correct one!), T is temp in K (C+273.15)
Since you have a before and after with the same n &R simplifies to
PV/T initial  = PV/T final
Now sub in your numbers and solve, round answer to 3 sigfigs

I need help with some chem homework ?

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