Question

Given the following reaction, how many molecules of H2O will be formed from 200.0g of NaOH?

2 NaOH + H2SO4 -> 2 H2O + Na2SO4

Answer 1

30.11×10²³ molecules

Step-by-step explanation:

Given data:

Mass of NaOH = 200.0 g

Number of molecules of water formed = ?

Solution:

Chemical equation:

2NaOH + H₂SO₄ → 2H₂O + Na₂SO₄

Number of moles of NaOH:

Number of moles = mass/molar mass

Number of moles = 200 g/ 40 g/mol

Number of moles = 5 mol

Now we will compare the moles of NaOH and H₂O.

NaOH : H₂O

2 : 2

5 : 5

Number of molecules of water:

1 mole contain 6.022×10²³ molecules

5 mol × 6.022×10²³ molecules / 1mol

30.11×10²³ molecules