At a temperature of 710 K, the vapour pressure of pure liquid Zn is given by: 𝑝𝑍𝑛(𝑋𝑧𝑛 = 1.0) = 3.6 × 10⁻⁴atm. The Raoultian activity coefficient (𝛾𝑍𝑛) of Zn in Zn-Cd alloy liquid at 710 K is approximated by: ln(𝛾𝑍𝑛) = 0.875(1 − 𝑋𝑍𝑛)² . The ratio [ 𝑝𝑍𝑛(𝑋𝑧𝑛=0.7) ] / 𝑝𝑍𝑛(𝑋𝑧𝑛=1.0)for a liquid alloy with 𝑋= 0.7 is ________. (to two decimal places).