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Calculate the mass in grams of a single water molecule.(a)

Introductory Chemistry | 5th Edition | ISBN: 9780321910295 | Authors: Nivaldo J Tro ISBN: 9780321910295 34

Solution for problem 54P Chapter 6

Introductory Chemistry | 5th Edition

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Introductory Chemistry | 5th Edition | ISBN: 9780321910295 | Authors: Nivaldo J Tro

Introductory Chemistry | 5th Edition

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Problem 54P

Calculate the mass in grams of a single water molecule.

(a) 5.94 × 1020 H2O2 molecules

(b) 2.8 × 1022 SO2 molecules

(c) 4.5 × 1025 O3 molecules

(d) 9.85 × 1019 CH4 molecules

Step-by-Step Solution:

Solution 54P

Here, we are going to calculate the mass of each of the given samples.

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,

        Mass of Avogadro’s number of particles = Molar mass

Therefore, mass of given number of particles = (Molar mass / Avogadro's number) x given number of particles

Thus,

The mass of given sample = (given number of particles/Avogadro's number) x molar mass

Step 3 of 3

Chapter 6, Problem 54P is Solved
Textbook: Introductory Chemistry
Edition: 5
Author: Nivaldo J Tro
ISBN: 9780321910295

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Calculate the mass in grams of a single water molecule.(a)

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