The results the student obtained using 50 cm^3 of sea water are: mass of empty evaporating basin = 23.57 g
mass of evaporating basin and dry solid residue = 25.23 g
Calculate the mass of solid dissolved in 1000 cm^3 of the sea water.

The answer for #3 is c but i don't know why

How many liters of oxygen gas, at standard temperature and pressure, will react with 35.8 grams of iron metal? 4 fe (s) + 3 o₂ (g) → 2 fe₂o₃ (s)

Which of the following statements about hybrid orbitals is or are true? choose all that apply. choose all that apply. under sp2 hybridization, the large lobes point to the vertices of an equilateral triangle. after an atom undergoes sp hybridization there is one unhybridized p orbital on the atom. the angle between the large lobes of sp3 hybrids is 109.5∘