Answer:
Explanation:
HF ,Hydrofluoric acid happens to be a weak acid and as we know that a weak acid is partially dissociated in water.
So when we dissolve HF in water it would subsequently dissociate into H⁺ and F⁻ions . The solution now would contain hydronium ion that is H+ ion.
The solution would also contain dissociated F⁻ ion and solvent H20 molecules.
The following reaction would take place:
HF+H₂O⇆H₃O⁺+F⁻
so the reaction in forward direction is the dissociation of HF into H₃O⁺(that is H⁺) and F⁻ion.
The backward reaction would be the recombination of H₃O⁺(that is H⁺) and F⁻ion to give back HF and H₂O
Answer:
1.27 atm is the final pressure of the oxygen in the flask (with the stopcock closed).
2.6592 grams of oxygen remain in the flask.
Explanation:
Volume of the flask remains constant = V = 2.0 L
Initial pressure of the oxygen gas =
Initial temperature of the oxygen gas =
Final pressure of the oxygen gas =
Final temperature of the oxygen gas =
Using Gay Lussac's law:
1.27 atm is the final pressure of the oxygen in the flask (with the stopcock closed).
Moles of oxygen gas = n
(ideal gas equation)
Mass of 0.08310 moles of oxygen gas:
0.08310 mol × 32 g/mol = 2.6592 g
2.6592 grams of oxygen remain in the flask.
C) Tc-99 is a radioactive isotope also known as radioisoptope.
<h3>Answer:</h3>
63.5456 amu
<h3>Solution:</h3>
Data Given:
Atomic Mass of ⁶³Cu = 62.9296 amu
Natural Abundance of ⁶³Cu = 69.17 %
Atomic Mass of ⁶⁵Cu = 64.9278 amu
Natural Abundance of ⁶⁵Cu = 30.83 %
Formula Used:
Average Atomic Mass = [(Atomic Mass of ⁶³Cu × Natural Abundance of ⁶³Cu) + (Atomic Mass of ⁶⁵Cu × Natural Abundance of ⁶⁵Cu)] ÷ 100
Putting values,
Average Atomic Mass = [(62.9296 × 69.17) + (64.9278 × 30.83)] ÷ 100
Average Atomic Mass = [(4352.8404) + (2001.7241)] ÷ 100
Average Atomic Mass = 6354.5645 ÷ 100
Average Atomic Mass = 63.5456 amu