a) Magnesium Nitrate:
The chemical formula for magnesium nitrate is Mg(NO3)2. To calculate the formula unit mass, we need to determine the atomic masses of each element in the compound.

The atomic mass of magnesium (Mg) is 24.31 g/mol.
The atomic mass of nitrogen (N) is 14.01 g/mol.
The atomic mass of oxygen (O) is 16.00 g/mol.

Since there are two nitrate ions (NO3) in the compound, we need to multiply the atomic masses of nitrogen and oxygen by 2.

Formula unit mass of magnesium nitrate = (1 x atomic mass of magnesium) + (2 x atomic mass of nitrogen) + (6 x atomic mass of oxygen)
= (1 x 24.31) + (2 x 14.01) + (6 x 16.00)
= 24.31 + 28.02 + 96.00
= 148.33 g/mol

Therefore, the formula unit mass of magnesium nitrate is 148.33 g/mol.

b) Calcium hydroxide:
The chemical formula for calcium hydroxide is Ca(OH)2. To calculate the formula unit mass, we need to determine the atomic masses of each element in the compound.

The atomic mass of calcium (Ca) is 40.08 g/mol.
The atomic mass of oxygen (O) is 16.00 g/mol.
The atomic mass of hydrogen (H) is 1.01 g/mol.

Since there are two hydroxide ions (OH) in the compound, we need to multiply the atomic masses of oxygen and hydrogen by 2.

Formula unit mass of calcium hydroxide = (1 x atomic mass of calcium) + (2 x atomic mass of oxygen) + (2 x atomic mass of hydrogen)
= (1 x 40.08) + (2 x 16.00) + (2 x 1.01)
= 40.08 + 32.00 + 2.02
= 74.10 g/mol

Therefore, the formula unit mass of calcium hydroxide is 74.10 g/mol.

c) Aluminum oxide:
The chemical formula for aluminum oxide is Al2O3. To calculate the formula unit mass, we need to determine the atomic masses of each element in the compound.

The atomic mass of aluminum (Al) is 26.98 g/mol.
The atomic mass of oxygen (O) is 16.00 g/mol.

Formula unit mass of aluminum oxide = (2 x atomic mass of aluminum) + (3 x atomic mass of oxygen)
= (2 x 26.98) + (3 x 16.00)
= 53.96 + 48.00
= 101.96 g/mol

Therefore, the formula unit mass of aluminum oxide is 101.96 g/mol.

Question

a) Magnesium Nitrate:
The chemical formula for magnesium nitrate is Mg(NO3)2. To calculate the formula unit mass, we need to determine the atomic masses of each element in the compound.

The atomic mass of magnesium (Mg) is 24.31 g/mol.
The atomic mass of nitrogen (N) is 14.01 g/mol.
The atomic mass of oxygen (O) is 16.00 g/mol.

Since there are two nitrate ions (NO3) in the compound, we need to multiply the atomic masses of nitrogen and oxygen by 2.

Formula unit mass of magnesium nitrate = (1 x atomic mass of magnesium) + (2 x atomic mass of nitrogen) + (6 x atomic mass of oxygen)
= (1 x 24.31) + (2 x 14.01) + (6 x 16.00)
= 24.31 + 28.02 + 96.00
= 148.33 g/mol

Therefore, the formula unit mass of magnesium nitrate is 148.33 g/mol.

b) Calcium hydroxide:
The chemical formula for calcium hydroxide is Ca(OH)2. To calculate the formula unit mass, we need to determine the atomic masses of each element in the compound.

The atomic mass of calcium (Ca) is 40.08 g/mol.
The atomic mass of oxygen (O) is 16.00 g/mol.
The atomic mass of hydrogen (H) is 1.01 g/mol.

Since there are two hydroxide ions (OH) in the compound, we need to multiply the atomic masses of oxygen and hydrogen by 2.

Formula unit mass of calcium hydroxide = (1 x atomic mass of calcium) + (2 x atomic mass of oxygen) + (2 x atomic mass of hydrogen)
= (1 x 40.08) + (2 x 16.00) + (2 x 1.01)
= 40.08 + 32.00 + 2.02
= 74.10 g/mol

Therefore, the formula unit mass of calcium hydroxide is 74.10 g/mol.

c) Aluminum oxide:
The chemical formula for aluminum oxide is Al2O3. To calculate the formula unit mass, we need to determine the atomic masses of each element in the compound.

The atomic mass of aluminum (Al) is 26.98 g/mol.
The atomic mass of oxygen (O) is 16.00 g/mol.

Formula unit mass of aluminum oxide = (2 x atomic mass of aluminum) + (3 x atomic mass of oxygen)
= (2 x 26.98) + (3 x 16.00)
= 53.96 + 48.00
= 101.96 g/mol

Therefore, the formula unit mass of aluminum oxide is 101.96 g/mol.

Knowee AI · Accepted Answer