which is the formula mass of na2so4?\no 119.06 amu\no 125.98 amu\no 142.05 amu\no 174.12 amu
which is the formula mass of na2so4?\no 119.06 amu\no 125.98 amu\no 142.05 amu\no 174.12 amu
Answer
Answer:
142.05 amu
Explanation:
Step1: Identify atomic masses
The atomic mass of Na (sodium) is approximately 22.99 amu, S (sulfur) is approximately 32.07 amu, and O (oxygen) is approximately 16.00 amu.
Step2: Calculate mass from sub - scripts
In Na₂SO₄, there are 2 Na atoms, 1 S atom, and 4 O atoms. The mass contribution of Na: $2\times22.99 = 45.98$ amu The mass contribution of S: $1\times32.07=32.07$ amu The mass contribution of O: $4\times16.00 = 64.00$ amu
Step3: Sum up the masses
$45.98+32.07 + 64.00=142.05$ amu