Find the heat that flows into or out of the system

[will_lansing]

Homework Statement

A system expands by 0.75 m^3 at a constant pressure of 125 kPa. Find the heat that flows into or out of the system if its internal energy
a. Increases by 65J
b. Decreases by 1850 J
give answer kJ

Homework Equations

The Attempt at a Solution

P=125 kPA
delta U=Q-W
W=P(delta U)
so i plug in the numbers
W=(125kPa)(0.75m^3)=93.75

Part a)
delta U=65kPA

65=Q-93.75
Q= 158.75 J= .15878 kJ

Part B)
1850= Q-93.75
Q= 1756.25J=1.77kJ

And the answer is wrong, can someone help me please

 

[Astronuc]

Is one sure about W=P(delta U)?

http://hyperphysics.phy-astr.gsu.edu/hbase/thermo/firlaw.html

What about W = P \DeltaV for an isobaric process?

 

[will_lansing]

no i meant W=P(delta V)
I just typed in the wrong thing
sorry for the mistake
so do you know what i should do