1 Type the correct answer in each box.
miles
kilometers kilometers
A race car is driven by a professional driver at 99 hour. What is this speed in hour and
minute?
1 mile = 1.61 kilometers
1 hour - 60 minutes
Express the answers to the correct number of significant figures.
kilometers
hour
kilometers
minute
The speed is equivalent to
or
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well in order to answer this question you have to provide more information < 3

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%