Test tube C started off as green. Why did it become yellow?

As the solution was breathed into, the turquoise-like color of the blue in the water started to turn green. Slowly, the green became fairly yellowish and then stopped changing color.

Explanation:

in the given question, the partial pressure is calculated by using the ideal gas equation, that is, pv = nrt

here, p is pressure, v is volume = 25 l, n is number of moles = 0.0104 moles, r is gas constant = -0.0821 l.atm / mol.k

t is temperature = 273 k

p = nrt / v

p = (0.0104 mol × 0.0821 l.atm / mol.k × 273 k) / 25 l

= 0.0093 atm

a:

by the combination of an unlimited number of elements