How many moles of sulfur tetrafluoride, SF4, are present in 1.63 grams of this compound?
moles
The correct answer and explanation is :
To determine the number of moles of sulfur tetrafluoride (SF₄) in 1.63 grams of the compound, we will use the formula:
$$
\text{moles} = \frac{\text{mass}}{\text{molar mass}}
$$
Step 1: Calculate the Molar Mass of SF₄
To calculate the molar mass of SF₄, we need to sum the atomic masses of sulfur (S) and fluorine (F):
- Atomic mass of sulfur (S) = 32.07 g/mol
- Atomic mass of fluorine (F) = 19.00 g/mol
Since there are four fluorine atoms in sulfur tetrafluoride, the molar mass of SF₄ is:
$$
\text{Molar mass of SF₄} = 32.07 \, \text{g/mol} + (4 \times 19.00 \, \text{g/mol}) = 32.07 \, \text{g/mol} + 76.00 \, \text{g/mol} = 108.07 \, \text{g/mol}
$$
Step 2: Use the Formula to Find Moles
Now that we know the molar mass of SF₄ is 108.07 g/mol, we can calculate the number of moles of SF₄ in 1.63 grams:
$$
\text{moles of SF₄} = \frac{1.63 \, \text{grams}}{108.07 \, \text{g/mol}} = 0.0151 \, \text{moles}
$$
Final Answer:
The number of moles of sulfur tetrafluoride (SF₄) in 1.63 grams of the compound is approximately 0.0151 moles.
Explanation:
To determine the number of moles, we need the mass of the substance and its molar mass. Moles are a unit used to count the number of entities (such as molecules, atoms, or ions) in a substance. The molar mass of a compound is the mass of one mole of that substance, and it can be calculated by adding up the atomic masses of all the elements present in the compound. Once we have the molar mass, we simply divide the given mass by the molar mass to find the number of moles. This is a standard method in chemistry for converting between mass and moles.