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Allison
Chemistry
19 May, 17:51
How many anions are in 0.500 g of MgBr2
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Skylar Koch
19 May, 17:56
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Given:
Mass of MgBr2 = 0.500 g
To determine:
Number of anions in 0.500 g MgBr2
Explanation:
Molar mass of MgBr2 = 24 + 2 (80) = 184 g/mol
Moles of MgBr2 = 0.500 g/184 g. mol-1 = 0.00271 moles
Based on stoichiometry-
1 mole of MgBr2 has 1 mole of Mg2 + cations and 2 moles of Br - anions
Therefore, 0.00271 moles of MgBr2 will have: 2 * 0.00271 = 0.00542 moles of Br-
Now,
1 mole of Br - contains 6.023 * 10²³ anions
0.00542 moles of Br - contain: 0.00542 * 6.023*10²³ = 3.264*10²¹ anions
Ans: There are 3.264*10²¹ anions in 0.5 g of MgBr2
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