Question

calculate the number of moles in 200 grams of Sodium hydroxide​

Answer 1

Hᴇʀᴇ ɪs Yᴏᴜʀ Aɴsᴡᴇʀ:-

Nᴜᴍʙᴇʀ ᴏғ Mᴏʟᴇs = Mᴀss ᴏғ Sᴜʙsᴛᴀɴᴄᴇ/Mᴀss ᴏғ Oɴᴇ Mᴏʟᴇ

Mᴀss ᴏғ NaOH = Mᴏʟᴀʀ Mᴀss ᴏғ Sᴏᴅɪᴜᴍ + Oxʏɢᴇɴ + Hʏᴅʀᴏɢᴇɴ

⇏23 + 16 + 1

⇏40 g/mol

Nᴜᴍʙᴇʀ ᴏғ Mᴏʟᴇ = 200/40

= 5 mol

Hᴏᴘᴇ ɪᴛ Hᴇʟᴘs ᴜʜ.....

Hᴀᴠᴇ ᴀ Gʀᴇᴀᴛ Dᴀʏ.....

Answer 2

5 mol

Explanation:

Step 1: determine the formula of the compound that you are asked to determine the number of moles. Sodium ion is a metal in the first group in the periodic table so it will have a +1 charge (Na 1+) Hydroxide is a polyatomic that most students memorize with a -1 charge (OH 1-). So the formula for sodium hydroxide is NaOH.

Step 2: determine the formula mass of the compound looking up the atomic mass on the periodic table. Multiply the mass by the number of atoms in the formula. Na is 22.99+ O is 16.00 + H is 1.008 = 40.0 g/mol. 3 significant figures.

Step 3: divide the given mass by the formula mass. Note that the grams units cancel and the answer is in moles. 200 g / 40 g /mol =5 mol.