Answer:
Carbon contain 4 electrons in its valence shell.
Explanation:
Because, total no. of electrons in carbon are 6, so in first shell there are 2 electrons and hence 4 in valence shell.
Answer:
A) There is an inverse relationship between stream velocity and incline of the
stream table. The greater the incline of the stream table, the greater the velocity of the
stream.
Explanation:
I believe this to be the answer.
<h3>Answer:</h3>
Density = 1.22 g.mL⁻¹
<h3>Solution:</h3>
Data Given:
Mass = 22.4 g
Volume = 18.3 mL
Density = ??
Formula used;
Density = Mass ÷ Volume
Putting values,
Density = 22.4 g ÷ 18.3 mL
Density = 1.22 g.mL⁻¹
The mass of ammonium chloride that must be added is : ( A ) 4.7 g
<u>Given data :</u>
Volume of water ( V ) = 250 mL = 0.25 L
pH of solution = 4.85
Kb = 1.8 * 10⁻⁵
Kw = 10⁻¹⁴
Given that the dissolution of NH₄Cl gives NH₄⁺⁺ and Cl⁻ ions the equation is written as :
NH₄CI + H₂O ⇄ NH₃ + H₃O⁺
where conc of H₃O⁺
[ H₃O⁺ ] = and Ka = Kw / Kb
∴ Ka = 5.56 * 10⁻¹⁰
Next step : Determine the concentration of H₃O⁺ in the solution
pH = - log [ H₃O⁺ ] = 4.85
∴ [ H₃O⁺ ] in the solution = 1.14125 * 10⁻⁵
Next step : Determine the concentration of NH₄CI in the solution
C = [ H₃O⁺ ]² / Ka
= ( 1.14125 * 10⁻⁵ )² / 5.56 * 10⁻¹⁰
= 0.359 mol / L
Determine the number of moles of NH₄CI in the solution
n = C . V
= 0.359 mol / L * 0.25 L = 0.08979 mole
Final step : determine the mass of ammonium chloride that must be added to 250 mL
mass = n * molar mass
= 0.08979 * 53.5 g/mol
= 4.80 g ≈ 4.7 grams
Therefore we can conclude that the mass of ammonium chloride that must be added is 4.7 g
Learn more about ammonium chloride : brainly.com/question/13050932