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Answer:
Mass = 3100 g
Explanation:
Given data:
Mass of MgSO₄.7H₂O = ?
Number of molecules = 7.61×10²⁴ molecules
Solution:
First of all we will calculate the number of moles of MgSO₄.7H₂O by using Avogadro number.
1 mole contain 6.022×10²³ molecules
7.61×10²⁴ molecules × 1 mol / 6.022×10²³ molecules
1.26×10¹ mol
12.6 moles
Mass of MgSO₄.7H₂O:
Mass = number of moles × molar mass
Molar mass of MgSO₄.7H₂O = 246 g/mol
Mass = 12.6 mol × 246 g/mol
Mass = 3100 g