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Answer 1 · 2017-04-05T17:27:44

#308#ml(3s.f.)

first, convert #1.50#atm to torr:

#1# atm = #760# torr

#1.5# atm #(p_2)# = #760*1.5# torr = #1140# torr

new pressure #(p_2): #1140# torr

boyle's law: #p# (pressure) * #v# (volume) = constant
#p_1 * v_1 =# constant
#p_2*v_2=# constant

here, the constant is #1140# torr * #250#ml = #285,000#.
#p_2*v_2 = 285,000#

#therefore p_1*v_1 = 285000#

#p_1 = 925# torr

#v_1 = 285000/925# ml = #308# ml (3s.f.)