Syringe tips and titrant solution in a container, unused solid reagent in the manufacturer's container and broken flask in the cardboard box.
Syringe tips are dispose into the disposal containers present in the lab or hospitals. Unused solid reagent is dispose in the manufacturer's container and then label the container with a hazardous waste tag so that people can't use it and stay away from it.
Broken flask is dispose in the cardboard box or a container. Titrant solution can also be dispose by placing in a container which is leak proof and closed the opening tightly so that it can't pollute and damaged the outside world.
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Answer:

Explanation:
We can use the Ideal Gas Law — pV = nRT
Data:
V = 15.0 L
n = 0.55 mol
T = 300 K
Calculation:

You can't create energy and you can transform it
Answer: (2)3.0 mol
Explanation: 222.3g= 222.3/74= 3.0 mol
1mol Ca(OH)2 is 74g