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3 years ago

Write a balanced chemical equation for the standard formation reaction of gaseous hydrogen iodide

Chemistry

1 answer:

shusha [124]3 years ago

5 0

Answer:

The balanced chemical equation for standard formation reaction of gaseous hydrogen iodide is

H2 + I2 gives 2HI.

enthalpy change of gaseous hydrogen iodide is 26.5 kJ/ mol

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What is the ph of a solution that results from mixing together equal volumes of a 0.020 m solution of ammonia and a 0.010 m solu

Fantom [35]

Answer:

pH = 9.25

Explanation:

Reaction of ammonia (NH₃) with hydrochloric acid (HCl) is:

NH₃ + HCl → NH₄⁺ + Cl⁻

As equal volumes of a 0.020M solution of NH₃ and a 0.010M solution of react, molarity of NH₃ after reaction is 0.010M and 0.010M of NH₄⁺.

For the buffer NH₄⁺/NH₃ H-H equation to find pH of solution is:

pH = pKa + log₁₀ [NH₃] / [NH₄⁺]

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3 years ago

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4 years ago

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What is the percentage by mass of oxygen in a formula unit of sodium hydrogen carbonate (NaHCO3)?

nadezda [96]

Percent by mass of an element can be calculated as

(Total mass of the element in the formula / formula weight ) * 100

Step 1 : Find formula weight of NaHCO₃

To find formula weight of NaHCO₃, we have to add atomic masses of the elements Na, H,C and O

Formula weight of NaHCO₃ = $Na+H+C+3 (O)$

Formula weight of NaHCO₃ = $22.99+1.01+12.01+3(16)$

Formula weight of NaHCO₃ is 84.01 g

Step 2 : Use percent by mass formula

Percent by mass of oxygen = (total mass of oxygen / formula weight) * 100

Percent by mass of oxygen = $\frac{3(16)}{84.01} * 100$

Percent by mass of oxygen = 57.14%

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Explanation:

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