Question

How to calculate the numbers of moles in 10g og NaOH?

Answer 1

n = 0.25mol.

Step-by-step explanation:

`mole = (mass)/(moar \: mass) \\ n = (m)/(capital \: m)`

where mass = 10g

M(NaOH) = Na × 1 + O × 1 + H ×1

= 23 + 16 + 1

= 40g/mol.

n = ?

therefore mole =

`n = (10)/(40 \\) \\ n = 0.25mol`

therefore mole = 0.25mol

Answer 2

There are 0.25 moles of NaOH in 10 grams of NaOH.

Step-by-step explanation:

To calculate the number of moles in a given mass of a substance, you can use the formula:

Moles = Mass (grams) / Molar Mass (grams/mol)

For sodium hydroxide (NaOH), you'll need to know its molar mass. The molar mass of NaOH is calculated as follows:

Sodium (Na) has a molar mass of approximately 22.99 g/mol.

Oxygen (O) has a molar mass of approximately 16.00 g/mol.

Hydrogen (H) has a molar mass of approximately 1.01 g/mol.

So, the molar mass of NaOH is:

Molar Mass (NaOH) = (1 × Molar Mass (H)) + (1 × Molar Mass (O)) + (1 × Molar Mass (Na))

Molar Mass (NaOH) = (1 × 1.01 g/mol) + (1 × 16.00 g/mol) + (1 × 22.99 g/mol)

Molar Mass (NaOH) = 40.00 g/mol

Now, you can calculate the number of moles of NaOH in 10 grams:

Moles (NaOH) = Mass (grams) / Molar Mass (grams/mol)

Moles (NaOH) = 10 g / 40.00 g/mol

Moles (NaOH) = 0.25 moles

So, there are 0.25 moles of NaOH in 10 grams of NaOH.