Question

Calculate the number of molecules found in 35 g of Sodium Hydroxide?

Answer 1

5.27*10^23 (rounded to 3 significant figures)

Step-by-step explanation:

The amount of molecules in one mole of anything is equal to Avogadro's number: 6.022×10^23

To find the number of moles of NaOH in 35 grams of it, do 35 divided by the molar mass (39.997): 35/39.997=0.87506562 moles of NaOH

To find the number of molecules, multiply the moles of NaOH by Avogadro's number: 0.87506562×(6.022×10^23)=5.26964522*10^23

Answer 2

5.27x10²³ molecules

Step-by-step explanation:

In order to solve this problem we first convert 35 g of Sodium Hydroxide (NaOH) into moles, using its molar mass:

• 35 g ÷ 40 g/mol = 0.875 mol

Finally we convert 0.875 moles into number of molecules, using Avogadro's number:

• 0.875 mol * 6.023x10²³ molecules/mol = 5.27x10²³ molecules