117 mL of 0.210 M K₂S solution
Explanation:
The question asks about the volume of 0.210 M K₂S (potassium sulfide) solution required to completely react with 175 mL of 0.140 M Co(NO₃)₂ (cobalt(II) nitrate).
We have the chemical reaction:
K₂S + Co(NO₃)₂ → CoS + 2 KNO₃
molar concentration = number of moles / volume (L)
number of moles = molar concentration × volume
number of moles of Co(NO₃)₂ = 0.140 × 175 = 24.5 mmoles
We see from the chemical reaction that 1 mmole of Co(NO₃)₂ is reacting with 1 mmole of K₂S, so 24.5 mmoles of Co(NO₃)₂ are reacting with 24.5 mmoles of K₂S.
volume = number of moles / molar concentration
volume of K₂S solution = 24.5 / 0.210 = 117 mL
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molar concentration
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I believe it occurs along the plates edge.
Answer:
The correct solution is "93.48 M".
Explanation:
According to the question,
The number of moles of NaOH will be:
= 
= 
The number of moles of needed 
will be:
= 
= 
hence,
The concentration of solution will be:
= 
= 
= 
The density of mercury is <span>5.43 g/cm³.</span>
Answer:
the mass of magnesium oxide will be less than the orginal peice of magnesium
Explanation:
because the magnesium burns to ashes in the presense of air
