Question

M(NaOH)=10г n(NaOH)-?

Answer 1

N=10/40=0,25 моль!!))

Answer 2

To calculate the number of moles (n) of NaOH (sodium hydroxide) from its mass (m), you can use the formula:

n = m / M

Where:

• n is the number of moles
• m is the mass of the substance (in grams)
• M is the molar mass of the substance (in g/mol)

The molar mass of NaOH is the sum of the atomic masses of its constituent elements: Na (sodium), O (oxygen), and H (hydrogen).

Molar mass of NaOH:

• M(Na) = 22.99 g/mol
• M(O) = 16.00 g/mol
• M(H) = 1.01 g/mol

Molar mass of NaOH = M(Na) + M(O) + M(H) Molar mass of NaOH = 22.99 g/mol + 16.00 g/mol + 1.01 g/mol Molar mass of NaOH = 40.00 g/mol

Given that the mass of NaOH (m) is 10 g, you can now calculate the number of moles (n):

n = m / M n = 10 g / 40.00 g/mol n = 0.25 moles

So, the number of moles of NaOH in 10 grams of the substance is 0.25 moles.