Question

How much atoms are present in 10 miles of na2so4

Answer 1

trillions. Basically innumerable.


and with that I became ambitious.

Answer 2

How many grams of sodium are there in 10. g of sodium sulfate, Na2SO4?

Na2SO4 = 142.04g/mol Atomic Mass S=32.06

5 answers · Chemistry

Best Answer

Na2SO4 = 142.04g/mol (so we're looking for relative atomic masses to 2 decimal places)

Sodium Na = 22.99 g/mol (from periodic table)

Sulphur S = 32.06 g/mol (from question)

Oxygen O = 16.00 g/mol (from periodic table)

We have 10g / 142.04g/mol = 0.07 moles of Sodium Sulfate.

Now all we need to know is how 0.07 moles of Sodium weighs.

0.07 x 22.99g/mol = 1.61g of Sodium in 10g of sodium sulfate.

Personally I would round that up to 2g since the question only gives the weight of sodium sulfate to the nearest unit but it's up to you how accurately you want to express your answer.

D'oh! Forgot to double it as it's Na2 SO4, there are 2 atoms of Sodium so it's 1.61 x 2 = 3.22g