Question

How many atoms are there in 5 gram of gold? ​

Answer 1

Answer:

hi

Explanation:

the answer is 6.02×1023 atoms of gold

please mark thanks

Answer 2

Answer:

Brainly.com

What is your question?

1

High School Chemistry 5 points

San8czynHerst

San8czynHerst Asked 12.14.2016

How many atoms of gold are in a 5 gram sample of pure gold?

See answers (1) Ask for details Follow Report

Answer Expert Verified

0

JcAlmighty

JcAlmighty

The answer is 1.505 × 10²² atoms

Avogadro's number is the number of units (atoms, molecules) in 1 mole of substance: 6.02 × 10²³ units per 1 mole

Number of moles (n) is the quotient of mass (m) and molar mass(Mr)

n = m/Mr

m = 5 g

Mr(Au) = 197 g/mol

n = 5g / 197g/mol = 0.025 mol = 2.5 × 0.01 = 2.5 × 10⁻² mol

If 6.02 × 10²³ atoms are in 1 mol, x atoms are in 2.5 × 10⁻² mol:

6.02 × 10²³ atoms : 1 mol = x : 2.5 × 10⁻² mol

x = 6.02 × 10²³ atoms * 2.5 × 10⁻² mol : 1 mol

x = 15.05 × 10²³⁻² atoms = 15.05 × 10²¹ atoms = 1.505 × 10²² atoms

i hope it will help u....