Answer:
To calculate the number of molecules, we need to first find the number of moles using the formula:
moles = mass / molar mass
The molar mass of Qi₂Jp3 can be calculated by adding the atomic masses of each element in the compound:
molar mass of Qi₂Jp3 = (2 × atomic mass of Q) + (1 × atomic mass of i) + (3 × atomic mass of J) + (1 × atomic mass of p)
Using the periodic table, we find the atomic masses of the elements to be:
Q = 114.82 g/mol
i = 126.90 g/mol
J = 30.97 g/mol
p = 30.97 g/mol
Therefore, the molar mass of Qi₂Jp3 is:
molar mass of Qi₂Jp3 = (2 × 114.82 g/mol) + (1 × 126.90 g/mol) + (3 × 30.97 g/mol) + (1 × 30.97 g/mol) = 469.55 g/mol
Now we can calculate the number of moles:
moles = mass / molar mass = 4.5 g / 469.55 g/mol = 0.00958 mol
Finally, we can calculate the number of molecules using Avogadro's number:
number of molecules = moles × Avogadro's number = 0.00958 mol × 6.022 × 10²³/mol = 5.77 × 10²¹ molecules
Therefore, the answer is not listed in the given options.