To calculate the mass of a compound, we need to consider the atomic masses of its constituent elements and the number of atoms present in the compound's formula.
Given:
- Atomic mass of X (let's assume it's carbon): 12
- Atomic mass of Y (let's assume it's hydrogen): 1
The formula of the compound X7Y9 suggests that there are 7 atoms of X and 9 atoms of Y in one molecule of the compound.
To calculate the molar mass of X7Y9, we multiply the atomic masses by their respective subscripts and sum them up:
Molar mass of X7Y9 = (7 * atomic mass of X) + (9 * atomic mass of Y)
Plugging in the values: Molar mass of X7Y9 = (7 * 12) + (9 * 1) = 84 + 9 = 93 g/mol
Now, we can calculate the mass of 4.74 moles of X7Y9 using the molar mass:
Mass = moles × molar mass Mass = 4.74 moles × 93 g/mol
Calculating: Mass = 444.42 g
Therefore, the mass of 4.74 moles of the compound X7Y9 would be 444.42 grams.