Answer:
10
Explanation:
you need to balance the reaction. the left must be equal to the fight hànd. multiply both sides by 2
So the question ask to calculate the Ks of the monoprotic acid where as it is dissolved in water to produce 0.0136 M solutions and the PH result of the solutions is 2.45. So the Ka of the problem is 1.25 x 10^-3. I hope you are satisfied with my answer and feel free to ask for more if you have questions and further clarifications about the problem
Answer:
The student measured the cup and got an incorrect answer
Explanation:
because he was in a rush.
The reaction between metallic Magnesium and steam will be
As per balanced equation:
one mole of Mg will react with two moles of water to give one mole of magnesium hydroxide
Moles of Mg = Mass / atomic mass = 19.4/24 = 0.81
Moles of water = mass / molar mass = 14/18 =0.78
thus here for 0.81 moles of Mg we need twice the moles of water
However we have just 0.78 moles of water it means the limiting reagent is water
The moles of Mg reacted with water = 0.5 X 0.78 = 0.39 moles
moles of Mg left after reaction = 0.81-0.39= 0.42 moles
mass of Mg left (excess reagent) = moles X atomic mass = 0.42 X 24 = 10.08g
The moles of Mg(OH)2 formed = 0.39 moles
mass of Mg(OH)2 formed = moles X molar mass = 0.39 X 58 = 22.62g
Answer:
any drug except weed and caffeine in moderate amounts decreases your life expectancy
Explanation: