Question

If you are given 0.572 grams of niobium (Nb) how many atoms of the element do you have?

Answer 1

0.037 × 10²³ atoms of Nb

Explanation:

First we calculate the number of moles of niobium (Nb):

number of moles = mass / molar weight

number of moles of Nb = 0.572 / 93 = 0.00615 moles

To find the number of atoms we use the Avogadro's number in order to devise the following reasoning:

if in          1 mole of Nb there are 6.022 × 10²³ atoms of Nb

then in     0.00615 moles of Nb there are X atoms of Nb

X = (0.00615 × 6.022 × 10²³) / 1

X = 0.037 × 10²³ atoms of Nb

Learn more about:

Avogadro's number

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