A toy plane with a mass of 1.5kg is flying in the air at 8.0m/s. what is its kinetic energy?

48 Joules

Explanation:

Givens

m = 1.5kg

v = 8.0 m/s

Formula

KE = 1/2 m v^2

Solution

KE = 1/2 * 1.5  * 8.0^2

KE = 1/2 * 1.5 * 64

KE = 48 Joules

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%

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