Question

How many moles of nickel are in

a 117 g Ni sample? The molar
mass of nickel is 58.69 g/mol.
A. 2.00 moles
B. 176 moles
C. 0.502 moles
D. 6,900 moles

Answer 1

Answer: A. 2.00 moles

Step-by-step explanation:

To determine the number of moles of nickel in a 117 g Ni sample, we can divide the mass of the sample by the molar mass of nickel:

moles = mass ÷ molar mass

= 117 g ÷ 58.69 g/mol

= 2 moles

Therefore, there are approximately 2 moles of nickel in a 117 g Ni sample and the correct answer is A. 2.00 moles

It is important to note that the molar mass of a substance is defined as the mass of one mole of that substance. One mole of a substance is equal to
`6.022` ×
`10^(23)` units of that substance, which is known as Avogadro's number. The molar mass of a substance is often used to convert between mass and number of moles, as shown in the calculation above.