Question

Calculate in moles the mass of 24.56 grams of manganese (mn)

A) 0.5 moles
B) 1 mole
C) 2 moles
D) 3 moles

Answer 1

To calculate the number of moles in a given mass of a substance, divide the mass by the molar mass of that substance.

Step-by-step explanation:

To calculate the number of moles in a given mass of a substance, we need to divide the mass by the molar mass of that substance. The molar mass of manganese (Mn) is 54.94 g/mol. Therefore, to find the number of moles in 24.56 grams of manganese, we divide the mass by the molar mass:

Number of moles = Mass / Molar mass

Number of moles = 24.56 g / 54.94 g/mol = 0.447 moles (rounded to three significant figures)