Question #85ef8

1 Answer
MeneerNask
Jan 13, 2017

You first work out the molar mass of potassium sulfide.

Explanation:

The molecular formula is #K_2S# so we add the atomic masses from the periodic system chart:
#m(K_2S)=m(K)+2xxm(S)=39.10+2xx32.07=103.24#
If we take this in grams, we have one mol (or mole).

So 5.8 mol would be #5.8xx103.24~~599g#

If we take care of the 2 significant digits in the 5.8, AND use the SI-unit, the answer would be #0.60kg# In grams it would be #6.0xx10^2g#

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