What is the number of moles of sodium hydroxide in 160 g of sodium hydroxide? (Given: Na = 23, O = 16, H = 1)

To calculate the number of moles of sodium hydroxide (NaOH) contained in 160 grams of it, you can use the following formula:

Number of moles = Mass (in grams) / Molar mass (in g/mol)

First, calculate the molar mass of NaOH:

Sodium (Na) has a molar mass of 23 g/mol.
Oxygen (O) has a molar mass of 16 g/mol.
Hydrogen (H) has a molar mass of 1 g/mol.
Now, add up the molar masses of the individual atoms in NaOH:

Molar mass of NaOH = (1 x Na) + (1 x O) + (1 x H)
Molar mass of NaOH = (1 x 23) + (1 x 16) + (1 x 1)
Molar mass of NaOH = 23 + 16 + 1
Molar mass of NaOH = 40 g/mol

Now, you can calculate the number of moles of NaOH:

Number of moles = Mass (in grams) / Molar mass (in g/mol)
Number of moles = 160 g / 40 g/mol

Number of moles = 4 moles

So, there are 4 moles of sodium hydroxide in 160 grams of it.