Answer:
Suppose that you add 29.2 g of an unknown molecular compound to 0.250 kg of benzene, which has a K f of 5.12 oC/m. With the added solute, you find that there is a freezing point depression of 2.78 oC compared to pure benzene. What is the molar mass (in g/mol) of the unknown compound
Explanation:
The mass of nonvolatile solute added is ---- 29.2g
The mass of solvent benzene is ---- 0.250kg = 250g
The Kf value of benzene is ---- 5.12^oC/m.
Depression in the freezing point of the solution is --- 2.78^oC.
What is the molar mass of the unknown solute?
Substitute the given values in this formula to get the molar mass of unknown solvent:
Hence, the molar mass of unknown solute is --- 215g/mol.
Answer:
the movement of particle of air filled inside the balloon changes as a result of change in temperature ...So, the density also the volume of gas is increased/decrease...
Explanation:
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Question:
Ammonium perchlorate NH₄ClO₄ is a powerful solid rocket fuel, used in the Space Shuttle boosters. It decomposes into nitrogen N₂ gas, chlorine Cl₂ gas, oxygen O₂ gas and water vapor, releasing a great deal of energy. Calculate the moles of water produced by the reaction of 2.5 mol of ammonium perchlorate. Be sure your answer has a unit symbol, if necessary, and round it to 2 significant digits.
Answer:
The number of moles of water produced by the reaction of 2.5 mol of ammonium perchlorate is 5 moles (of H₂O).
Explanation:
To solve the question, we are required to know the amount of each reagent and products there are in the balanced chemical reaction as follows
2 NH₄ClO₄ → N₂ + Cl₂ + 2O₂ + 4H₂O
From the chemical reaction stoichiometry, it shows that 2 moles of ammonium perchlorate, NH₄ClO₄ produces 4 moles of H₂O
Therefore 2.5 moles of ammonium perchlorate will produce moles of H₂O or 5 moles of H₂O.
The standard temperature is 0c.
the standard pressure is 1atm.
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