Question

ʜᴏᴡ ᴍᴀɴʏ ᴍᴏʟᴇꜱ ᴏꜰ ɴᴀᴏʜ ᴀʀᴇ ᴘʀᴇꜱᴇɴᴛ ɪɴ 160ɢ ᴏꜰ ɪᴛ​

Answer 1

Given:-

→Mass of NaOH(Sodium Hydroxide) = 160g

To find:-

→Number of moles present in 160g of NaOH

Solution:-

•Atomic mass of Na(Sodium) = 23u

•Atomic mass of O(Oxygen) = 16u

•Atomic mass of H(Hydrogen) = 1u

Thus,molecular mass of NaOH:-

= 23+16+1

= 40u

Since,molecular mass of NaOH is 40u

Thus,molar mass of NaOH is 40g.

Now:-

Number of moles:-

Given mass/Molar mass

= 160/40

= 4 moles

Thus, 4 moles of NaOH are present

in 160g of it.