Question

4.5 × 1025 atoms of nickel equal how many moles? A. 27 mol B. 2.7 × 1048 mol C. 0.75 mol D. 75 mol

Answer 1

Answer:

75 mol

Explanation:

The number of atoms in a mole of substance is 6.023X10²³ [Avagadro's number]

if the given sample of nickel contains 4.5X10²⁵ atoms it means the moles are

moles = $\frac{numberofatoms}{Avagadro'snumber}$

moles = $\frac{4.5X10^{25}}{6.023X^{23}}=74.71mol$

If we round of the given answer the number of moles = 75 moles

Answer 2

It's 75
PS use ^ to mean to the power of