Answer:
The correct option is c
Step-by-step explanation:
The formula to use here is
n = m ÷ m.m
where is n = number of moles
m = mass of the substance (Mn)
m.m = molar mass (of Mn)
The number of moles was not given but can be calculated from the value given (the number of particles/atoms).
Number of atoms = number of moles (n) × avogadro's constant
Hence n = Number of atoms ÷ avogadro's constant
Avogadro's constant = 6.02 × 10²³ mol⁻¹
Number of atoms = 1.00 ₓ 10²⁴
n = 1.00 ₓ 10²⁴ ÷ 6.02 × 10²³
n = 1.66 moles
Recall n = m ÷ m.m
∴ m = n × m.m
molar mass of Manganese (Mn) = 55 g/mol
m = 1.66 × 55
m = 91.3 g (option c)