The formula for Molarity is given by:
M = moles / V
To isolate V,
V = moles / M ------------------(1)
Moles can also be calculated as:
moles = mass / M.mass -------------(2)
Substituting the value of moles from equation 2 into equation 1 yields:
V = (mass / M.mass) / M
Plugging in the numbers gives:
V = (45 g / 164 g/mol) / 1.3 mol/dm³
V = 0.21 dm³.
Answer:
1.2×10²³ atoms.
Explanation:
In the problem, we see the data:
Mole of propanone = 0.20 mole
Calculating the number of atoms in propanone =?
According to Avogadro's principle, one mole of a substance contains 6.022×10²³ atoms.
This means that one mole of propanone also holds 6.022×10²³ atoms.
Thus, we can determine the atom count in 0.20 mole of propanone as:
1 mole of propanone contains 6.022×10²³ atoms.
Accordingly, 0.20 mole of propanone will have = 0.2 × 6.022×10²³ = 1.2×10²³ atoms.
Therefore, 0.20 mole of propanone contains
1.2×10²³ atoms.
