Gauge pressure of air to which the ball must have been

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Gauge pressure of air to which the ball must have been originally inflated so that it would be equal 1 bar gauge at the stadium is

1. 2.23 bar
2. 1.94 bar
3. 1.07 bar
4. 1.00 bar

Correct Option: C

P₂V₁ = mRT₂
m = 0.6266 kg
P₁V₁ = mRT₁

P₁ =	(0.6266) (281) (288)
	0.75

P₁, abs = 2.07 bar
P₁, gauge = 2.07 – 1 = 1.07 bar