the answer i believe is electrolytes.
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I think the answer to the question is number 2 "make your own non-toxic cleaning products using common kitchen ingredients"
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the systematic name is called Lithium sulfide.
If the formula for density=m/v, you can manipulate this formula to the the mass. After manipulation, you get the equation for mass to be: m=density * volume. With density and volume given, we can find the mass.
mass= (8.9) * 6 = 53.4grams