Answer:
B
Explanation:
Ethanol is C2H6O. Carbon diozidex is CO2. Ethanol has hydgrogen, where carbon dioxide does not.
The mass of sulfur in the sample is 0.31g
To calculate mass of sulfur in sample: given that amount galena is 2.34g and mass of lead is 2.03 g as galena contain both lead and sulfur the mass of sulfur = mass of galena- mass of lead , that is, 2.34- 2.03=0.31g.The molecular mass is a algebraic sum of atomic mass of each element in the compound thus the mass of the compound can be obtained by adding atomic of each element. Lead(II) sulphide occurs naturally as the mineral galena, often known as lead glance (PbS). It is a significant source of silver and the most significant lead ore.
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Answer: A because it’s correct
Answer:
Kc = 0.042
Explanation:
PCl₅ → PCl₃ + Cl₂
The equilibrium constant's equation will be
Kc = [PCl₃] [Cl₂] / [PCl₅]
Kc = (0.02 x 0.02) / 0.0095
Kc = 0.0421
The equilibrium constant for the given reaction is 0.0421.
