How many grams of sodium carbonate (Na2CO3) are needed to produce 6.78 moles of sodium chloride (NaCl). the molar mass of sodium carbonate is 105
99 g/mol.

359.3g of Na₂CO₃ are required

Explanation:

When sodium carbonate, Na₂CO₃ reacts with HCl, NaCl and H₂O are produced as follows:

Na₂CO₃ + 2HCl → 2NaCl + CO₂ + H₂O

Where 1 mole of sodium carbonate produce 2 moles of NaCl

To solve this question, we must find the moles of sodium carbonate required to produce the 6.78 moles of NaCl. With this mass and the molar mass we can find the mass of sodium carbonate as follows:

Moles Na₂CO₃:

6.78 moles NaCl * (1mol Na₂CO₃ / 2mol NaCl) = 3.39 moles Na₂CO₃

Mass Na₂CO₃ -Molar mass: 105.99g/mol:

3.39 moles Na₂CO₃ * (105.99g / mol) =

answer:

the answer is 6 valence electrons.

explanation:

valence is the # of electrons on the outer most shell of an atom.

oxygen has 6.

although, the valency of oxygen is 2, because it only needs to make 2 covalent bonds, or gain 2 electrons, to achieve the stable octet configuration of a noble gas.

that's it!

if you need further assistance, let me know: )

~ trueboss72

idk i'm not smart

explanation:

t h