What masses of each element are present in 7.15 moles of mg(no3)2?
Answer:
– Mass of Mg: 173.91 grams
– Mass of N: 100.07 grams
– Mass of O: 685.20 grams
Explanation:
To determine the masses of each element in 7.15 moles of Mg(NO3)2, we need to calculate the molar mass of the compound and then use stoichiometry to find the mass of each element.
The molar mass of Mg(NO3)2 can be calculated by adding up the atomic masses of each element in the compound:
Mg(NO3)2:
– Mg: 24.31 g/mol
– N: 14.01 g/mol
– O: 16.00 g/mol (there are three oxygen atoms in each nitrate ion, so we multiply the atomic mass by 3)
Molar mass of Mg(NO3)2 = (24.31 g/mol) + (14.01 g/mol) + (16.00 g/mol x 3) + (16.00 g/mol x 3) = 148.31 g/mol
Now, we can use stoichiometry to find the mass of each element in 7.15 moles of Mg(NO3)2.
Mass of Mg = (molar mass of Mg) x (number of moles of Mg(NO3)2)
Mass of Mg = 24.31 g/mol x 7.15 mol = 173.91 g
Mass of N = (molar mass of N) x (number of moles of Mg(NO3)2)
Mass of N = 14.01 g/mol x 7.15 mol = 100.07 g
Mass of O = (molar mass of O) x (number of moles of Mg(NO3)2) x (number of oxygen atoms in Mg(NO3)2)
Mass of O = 16.00 g/mol x 7.15 mol x 6 = 685.20 g
Therefore, in 7.15 moles of Mg(NO3)2, the masses of each element are approximately:
– Mass of Mg: 173.91 grams
– Mass of N: 100.07 grams
– Mass of O: 685.20 grams
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