REMINDER* 6.02x10^23 = 6.02x1023 How many moles are in 87.3 grams
of Magnesium?
How many moles are in 3.2 x10^20
molecules of Fluorine?
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How many moles are in 32grams of
NaCl?
How many atoms are in 2 moles of
KBr?
How many grams are in 1.2 moles
of Potassium?
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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%

2b2t

explanation:

2b2t

your answer is a. the enthalpy of formation for a pure element in its standard state is always positive.

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