Dear aspirant,
According to gas law , for a particular gas at a constant temperature the relation becomes P¹V¹=P²V² .now as given
V¹ = 400ml
P² = 100 mm
V² = 1000ml ;
P¹ =??
Applying the above rule we get
P¹ = 1000*100 /400
P¹ = 250mm
So, the initial pressure was 250 mm.
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