A student performs the following procedure:

Procedure

1. Measure 25 grams of an unknown solid.

2. Measure 200 grams of water.

3. Pour the unknown solid and water into beaker, which weighs 50 grams.

4. Stir the solution.

The student records the following observation:

Observation

About half of the unknown solid dissolves and the other half settles to the bottom of the beaker.

Part A:

The student calculated the combined weight of the unknown solid and the water to be 275 grams. Describe the mistake the student made in this calculation.

Part B:

Describe how stirring the solution will affect the total amount of matter in this investigation.

The conventional equilibrium constant expression (kc) for the system below is: 2icl(s) ⇄ i2(s) + cl2(g) [cl2] ([i2] + [cl2])/2[icl] [i2][cl2]/[icl]2 none of the listed answers are correct [i2][cl2]/2[icl]

Listen base your answer to the question on the information below. propane is a fuel that is sold in rigid, pressurized cylinders. most of the propane in a cylinder is liquid, with gas in the space above the liquid level. when propane is released from the cylinder, the propane leaves the cylinder as a gas. propane gas is used as a fuel by mixing it with oxygen in the air and igniting the mixture, as represented by the balanced equation below. c3h8(g) + 5o2(g) → 3co2(g) + 4h2o() + 2219.2 kja small amount of methanethiol, which has a distinct odor, is added to the propane to consumers detect a propane leak. in methanethiol, the odor is caused by the thiol functional group (–sh). methanethiol, ch3sh, has a structure that is very similar to the structure of methanol. what is the correct structural formula for a molecule of methanethiol

Calculate the number of moles of ethane in 100 grams