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First, you start by listing all of your givens; this will help you know what you have, and what you need to find.

V1 = 2.8 L

T1 = 25 C + 273 = 300 K. The temperature always has to be in kelvin; so, if you degree Celsius, you have to convert it to kelvin by using the equation K= degrees Celsius + 273

V2 = 15L

T2 = ?

V1/T1 = V2/T2 By looking at our given, we know you have to use this equation.

2.8L/300K = 15L/T2 We have to cross-multiply. (Basic Algebra)

T2 2.8L/2.8L = 4500KL/2.8L

T2 = 1607 K

1607 K = 1334 C

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Q: A gas has a volume of 2.8L at a temp of 27 celsius What temp Celsius is needed to expand the volume to 15L?
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