Answer to Question #106493 in Chemistry for emily

Question

give number of moles and number of particles for atoms in 15.0 g of neon, Ne (20.18 g/mol)

Answer 1

Solution:

1) Calculate the number of moles:

n(Ne) = m(Ne) / M(Ne) = (15.0 g) / (20.18 g/mol) = 0.743 mol.

n(Ne) = 0.743 mol.

2) The number of particles of neon (Ne) can be calculated using the Avogadro constant (N_a) and the amount of Ne in mole:

number of particles = Avogadro constant × amount (mol)

N(Ne) = N_a * n(Ne);

N(Ne) = (6.022*10²³ particles/mol) * (0.743 mol) = 4.474*10²³ particles of neon.

N(Ne) = 4.474*10²³ atoms of Ne.

Answer: 0.743 mol and 4.474*10²³ atoms in 15.0 g of neon (Ne).