Calculate the number of moles in 3.20 g of each of the following:
SnO2
Express your answer in moles
To calculate the number of moles in a given substance, we can use the formula:
moles = mass (g) / molar mass (g/mol)
First, we need to calculate the molar mass of SnO2.
The atomic mass of Sn (tin) is 118.71 g/mol.
The atomic mass of O (oxygen) is 16.00 g/mol.
Since SnO2 contains one tin atom and two oxygen atoms, we can add the molar masses to get the molar mass of SnO2:
molar mass of SnO2 = (1 * molar mass of Sn) + (2 * molar mass of O)
molar mass of SnO2 = (1 * 118.71 g/mol) + (2 * 16.00 g/mol)
molar mass of SnO2 = 118.71 g/mol + 32.00 g/mol
molar mass of SnO2 = 150.71 g/mol
Now we can use the formula to calculate the number of moles in 3.20 g of SnO2:
moles = mass (g) / molar mass (g/mol)
moles = 3.20 g / 150.71 g/mol
moles = 0.0213 mol
So, there are 0.0213 moles in 3.20 g of SnO2.
To calculate the number of moles in a given mass of a substance, we use the formula:
moles = mass (in grams) / molar mass
First, we need to find the molar mass of SnO2.
The molar mass of Sn is 118.71 g/mol, and the molar mass of O is 16.00 g/mol.
To calculate the molar mass of SnO2, we multiply the molar mass of Sn by 1 (since there is only 1 Sn atom in SnO2), and add it to the molar mass of O multiplied by 2 (since there are 2 O atoms in SnO2).
Molar mass of SnO2 = (118.71 g/mol) + (16.00 g/mol × 2) = 118.71 g/mol + 32.00 g/mol = 150.71 g/mol
Now, substituting the values into the formula:
moles = mass / molar mass
moles = 3.20 g / 150.71 g/mol
moles = 0.0212 mol
Therefore, the number of moles in 3.20 g of SnO2 is 0.0212 mol.
To calculate the number of moles in a given substance, you need to use the molar mass of that substance. The molar mass is the mass of one mole of a substance and is expressed in grams/mol.
The molar mass of SnO2 can be calculated by adding up the atomic masses of its constituent elements.
The atomic mass of Sn (tin) is 118.71 g/mol, and the atomic mass of O (oxygen) is 16.00 g/mol. Since there are two oxygen atoms in SnO2, we need to multiply the atomic mass of O by 2.
Therefore, the molar mass of SnO2 can be calculated as follows:
Molar mass of SnO2 = (atomic mass of Sn) + (2 * atomic mass of O)
= 118.71 g/mol + (2 * 16.00 g/mol)
= 118.71 g/mol + 32.00 g/mol
= 150.71 g/mol
Now, we can use the molar mass to calculate the number of moles in 3.20 g of SnO2.
Number of moles = mass of substance / molar mass
Number of moles of SnO2 = 3.20 g / 150.71 g/mol
≈ 0.0212 mol
Therefore, there are approximately 0.0212 moles of SnO2 in 3.20 g of SnO2.