Answer
(i) $3.42 \space bar$
(ii) $3.38 \space atm$
Work Step by Step
Boyle's law: $p_iV_i = p_fV_f$
$$V_i - 2.20 \space dm^3 = V_f = 4.65 \space dm^3$$ $$V_i = 4.65 \space dm^3 + 2.20 \space dm^3 = 6.85 \space dm^3$$
$$p_i(6.85 \space dm^3) = (5.04 \space bar)(4.65 \space dm^3)$$ $$p_i = \frac{(5.04 \space bar)(4.65 \space dm^3)}{6.85 \space dm^3} = 3.42 \space bar$$
$$1 \space atm = 1.01325 \space bar$$
$$3.42 \space bar \times \frac{1 \space atm}{1.01325 \space bar} = 3.38 \space atm$$
