Number of moles of HCl and Na2CO3 (show calculations) when 0.015 g of Na2CO3.

How can I calculate this problem if I am only given the 0.015 grams of Na2CO3?

To calculate the number of moles of Na2CO3, you need to use the formula:

Moles = Mass / Molar Mass

First, you need to find the molar mass of Na2CO3.

The molar mass of Na2CO3 can be calculated by adding up the atomic masses of each element in the compound:

Molar mass = 2(Na) + (C) + 3(O)

Looking up the atomic masses on the periodic table:

Molar mass = 2(22.99 g/mol) + 12.01 g/mol + 3(16.00 g/mol)
Molar mass = 46.00 g/mol + 12.01 g/mol + 48.00 g/mol
Molar mass = 106.01 g/mol

Now, you can calculate the number of moles of Na2CO3:

Moles = 0.015 g / 106.01 g/mol
Moles = 0.00014 mol

Therefore, there are approximately 0.00014 moles of Na2CO3 in 0.015 grams of Na2CO3.

To find the number of moles of HCl, we need more information about the reaction stoichiometry or the concentration of HCl solution.

To calculate the number of moles of HCl and Na2CO3, you need to use their respective molecular weights.

1. Determine the molecular weight of Na2CO3:
The molecular weight of Na2CO3 is the sum of the atomic masses of its constituent atoms.
Na (sodium) = 23 g/mol
C (carbon) = 12 g/mol
O (oxygen) = 16 g/mol
So, the molecular weight of Na2CO3 = 2(23) + 12 + 3(16) = 46 + 12 + 48 = 106 g/mol.

2. Calculate the number of moles of Na2CO3 using the given mass:
To calculate the number of moles, divide the given mass by the molecular weight.
Number of moles of Na2CO3 = Mass of Na2CO3 / Molecular weight of Na2CO3
= 0.015 g / 106 g/mol
≈ 0.00014 mol.

3. HCl dissociates in water to give hydrogen ions (H+) and chloride ions (Cl-). Therefore, the number of moles of HCl is equal to the number of moles of Na2CO3.

So, in this case, the number of moles of HCl would also be approximately 0.00014 mol.