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# How many atoms are in each elemental sample?(a) 16.9

ISBN: 9780321910295 34

## Solution for problem 37P Chapter 6

Introductory Chemistry | 5th Edition

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Problem 37P

How many atoms are in each elemental sample?

(a) 16.9 gSr

(b) 26.1 gFe

(c) 8.55 gBi

(d) 38.2 gP

Step-by-Step Solution:

Solution 37P

Here, we are going to calculate the number of atoms in each of the given elemental sample.

Step 1:

One mole of any species is that quantity in number having a mass equal to its atomic or molecular mass in grams.

The number of particles (atoms, molecules or ions) present in 1 mole of any substance is fixed, with a value of 6.022 × 1023. This is an experimentally obtained value. This number is called the Avogadro Constant or Avogadro Number.

Step 2:

Therefore, 1 mole = molar mass

1 mole = Avogadro number of particles

Combining the two statements, we get,

Molar mass = Avogadro's number of particles

Therefore, number of particles in a given mass = (Avogadro's number / molar mass) x given mass

Thus,

The number of atoms in a given elemental sample = (given mass/molar mass) x Avogadro number

Step 3 of 3

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