Question

You have 7 moles of H2O. How many particles are present?(Avogadro's Number is 6 x 10^23) a 4.2 x 10^23 b 4.2 x 10^24 c 4.2 d 42

Answer 1

Answer

b. 4.2 x 10²⁴

Explanation

Given:

Moles of H2O = 7 moles

Avogadro's Number is 6 x 10²³

What to find:

The number of articeles of H2O present in 7 moles of H2O.

Solution:

1 mole f any substanc contains 6 x 10²³ partcicles

Therefore 7 moles of H2O will contain

$\frac{7\text{ }moles}{1\text{ }mole}\times6\times10^{23}\text{ }particles=4.2\times10^{24}\text{ }particles$

The correct answer is option:

b. 4.2 x 10²⁴