Resources 8.6%
A mixture of He, N2, and Ar has a pressure of 16.5 atm at 28.0 °C. The partial pressure of He is 2707 mmHg and that of Ar
is 915 mmHg
What is the partial pressure of N2?
atm

atm i think im not sure

Explanation:

c is the answer because when something is left after something evaporates that shows the chemical change.

1. for the first question, we must find the mass of the anhydrous salt, mgso₄. the molar mass for mgso₄·7h₂o is 246.47 g/mol, while that of mgso₄ is 120.37 g/mol.7.834 g mgso₄·7h₂o * 1 mol mgso₄·7h₂o/246.47 g * 1 mol mgso₄/1 mol mgso₄·7h₂o * 20.37 g mgso₄/mol = 0.647 g mgso₄

2. mass of water = mass of sample - mass of anhydrous salemass of water = 7.834 - 0.647 = 7.19 gpercent water in hydrate = 7.19/7.834 * 100 = 91.74%