A balloon has a volume of 1.0L at 21.0 degrees C and 750 mmHg. What is the balloon's volume at STP ?

1 Answer
anor277
Aug 18, 2016

We need first to define conditions of #"STP"#.

Explanation:

#"Standard temperature and pressure"# specifies #273.15*K# and #100*kPa# #=# #"1 bar"#

Now #"1 bar"# #-=# #"750 mm Hg"#

Thus #(cancelP_1V_1)/T_1# #=# #(cancelP_2V_2)/T_2#

#V_2# #=# #V_1/T_1xxT_2# #=# #1.0*Lxx(294.15*K)/(273.15*K)# #=# #"a bit over 1 litre"#.

The volume increase makes sense as we increase the temperature, we should increase the volume of a fixed quantity of gas.

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