8th Grade Middle School Science You measure the mass of an apple using a balance. You get these three measurements:

Trial 1: 167.0 g
Trial 2: 166.9 g
Trial 3: 167.2 g

You know that the true mass of the apple is 172 g. Describe your results in terms of precision and accuracy. Explain your answer.​

Your results are precise, but not very accurate.

Explanation:

The results are precise because each weight is close to the next. The weights are not accurate because they are pretty far from the true mass.

The results of the three trials are accurate because there all very close to the correct mass of the apple is, 172 g. The results are precise because each weight is close to the next. The weights are not accurate because they are pretty far from the true mass.

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%

there is none because earth is stationary and flat.