potassium and water is 50 g in mass
will potassium hydroxide and hydrogen be 60 g in mass?
if not, what is the mass of potassium hydroxide and hydrogen
No, the mass of the potassium hydroxide and hydrogen will not be 60 g.
To calculate the mass of potassium hydroxide and hydrogen, we need to first determine the chemical reaction that occurs when potassium reacts with water. The chemical equation for this reaction is:
2K + 2H2O -> 2KOH + H2
From the equation, we can see that 2 moles of potassium react with 2 moles of water to form 2 moles of potassium hydroxide and 1 mole of hydrogen.
The molar mass of potassium hydroxide (KOH) is 56.11 g/mol, and the molar mass of hydrogen (H2) is 2.02 g/mol.
Given that the mass of potassium and water is 50 g, we can calculate the moles of potassium and water present in the reaction:
- Moles of K = 50 g / 39.10 g/mol = 1.28 moles
- Moles of H2O = 50 g / 18.02 g/mol = 2.77 moles
Since the reaction is stoichiometric, the limiting reactant will determine the amount of products formed. In this case, potassium is the limiting reactant.
Since 1 mole of K reacts with 1 mole of H2O to form 1 mole of KOH and 0.5 moles of H2, we can calculate the moles of potassium hydroxide and hydrogen formed:
- Moles of KOH = 1.28 moles of K * 1 mol KOH / 1 mol K = 1.28 moles
- Moles of H2 = 1.28 moles of K * 0.5 mol H2 / 1 mol K = 0.64 moles
Now, we can calculate the mass of potassium hydroxide and hydrogen formed:
- Mass of KOH = 1.28 moles * 56.11 g/mol = 71.769 g
- Mass of H2 = 0.64 moles * 2.02 g/mol = 1.2928 g
Therefore, the total mass of potassium hydroxide and hydrogen formed is approximately 73.06 g.