123 005w of heat is removed from water vapour (at 373k) condensing on the outer surfaces (at 363k) of an array of cylinders of length 0.6m and diameter 0.05m. how many cylinders are needed if the heat transfer coefficient is 3000w/m2k? hints: round off to the nearest integer and use newton's law of cooling.

c- cold periods in earth's history during which glaciers covered much of the surface.

explanation:

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%

50.23 i believe is correct but don't quote me on that.