Draw the structural formula (not the skeletal formula) for 2-octene.

Explanation:

2-octene is a structural isomer of octene. Octene is an unsaturated hydrocarbon (alkene) with 8 carbon atoms. The structural formula of 2-octene is seen below

    H               H    H   H   H  H

     I                 I     I     I     I    I

H- C - C = C - C - C - C - C - C - H

     I     I     I     I     I     I     I     I

    H   H    H   H   H   H   H   H

The structural formula of 2-octene is different from that of octene in the sense that, it's double bond is found in between the second and the third carbon (on the second bond position).

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%