Portland cement contains some SiO2. Calculate the mass percent composition of silicon in this compound.
(atomic mass Si/molar mass SiO2)* 100 = ?% Si.
I did the fitrst part and got 46.7 but theresa second part of the question
Small amounts of CoO are added to glass to give it a blue color. Calculate the mass percent composition of cobalt in this compound
To calculate the mass percent composition of silicon (Si) in Portland cement, we need to know the molar mass of silicon and the molar mass of Portland cement.
From the periodic table, the molar mass of silicon (Si) is 28.0855 g/mol.
The composition of Portland cement can vary, but a general formula is:
2CaO · SiO2 · 3H2O
The molar mass of Portland cement can vary depending on its composition and specific type, but for simplicity, let's assume it has a molar mass of 250 g/mol.
To determine the mass percent composition of silicon in Portland cement, we need to know the molar mass of silicon in the compound and divide it by the molar mass of the whole compound, then multiply by 100 to convert it to a percentage.
Mass percent composition of silicon (Si) = (Molar mass of Si / Molar mass of Portland cement) x 100
Mass percent composition of silicon (Si) = (28.0855 g/mol / 250 g/mol) x 100
Mass percent composition of silicon (Si) ≈ 11.23%
Therefore, the mass percent composition of silicon in Portland cement is approximately 11.23%.
To calculate the mass percent composition of silicon (Si) in Portland cement, we need to know the chemical formula of Portland cement and the molar mass of Si.
The chemical formula of Portland cement is not a single compound but rather a mixture of several compounds. However, one of the main components of Portland cement is tricalcium silicate, which has the chemical formula Ca3SiO5.
To determine the mass percent composition of silicon in Portland cement, we need to calculate the molar mass of SiO2 and Ca3SiO5, and then use these values to calculate the mass percent.
Let's start by calculating the molar mass of silicon (Si). The atomic mass of silicon is 28.09 g/mol.
Next, let's calculate the molar mass of SiO2. The atomic mass of oxygen (O) is 16.00 g/mol, so the molar mass of SiO2 is:
Molar mass of SiO2 = (atomic mass of Si) + 2*(atomic mass of O)
= 28.09 + 2*(16.00)
= 60.09 g/mol
Now, let's calculate the molar mass of Ca3SiO5. The atomic mass of calcium (Ca) is 40.08 g/mol. So the molar mass of Ca3SiO5 is:
Molar mass of Ca3SiO5 = 3*(atomic mass of Ca) + (atomic mass of Si) + 5*(atomic mass of O)
= 3*(40.08) + 28.09 + 5*(16.00)
= 147.33 g/mol
Finally, let's calculate the mass percent composition of silicon (Si) in Ca3SiO5. To do this, we need to divide the molar mass of silicon by the molar mass of Ca3SiO5 and multiply by 100:
Mass percent composition of silicon = (molar mass of Si / molar mass of Ca3SiO5) * 100
= (28.09 / 147.33) * 100
≈ 19.04%
Therefore, the mass percent composition of silicon in Portland cement is approximately 19.04%.