Question

. If 0.2 mol of the sodium hydroxide is required then how many grams of it should be taken?​

Answer 1

Given - Number of moles 0.2

Find - Grams of sodium hydroxide

Solution - Number of moles can be used to calculate the mass of sodium hydroxide by the relation - Number of moles = mass/molecular mass.

Molecular mass of sodium hydroxide is 40 gram/mole.

Keeping the values in formula to find mass of sodium hydroxide to be taken.

Mass = Number of moles*molecular mass

Mass = 0.2*40

Mass = 8 gram

Hence, 8 grams of sodium hydroxide should be taken.

Answer 2

Here we have to find the mass of sodium hydroxide in 0.2 moles

• The molar mass of sodium hydroxide is 40 g

• This means that 1 mole of sodium hydroxide has a mass of 40 grams

• So, in order to find the mass of sodium hydroxide in 0.2 moles, we will use the unitary method

1 mole sodium hydroxide = 40 g

0.2 mole sodium hydroxide = 40 × 0.2

                                              = 8 g

Therefore, if 0.2 mol of sodium hydroxide is required then 8 grams of it should be taken.