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In which of the following sentences is the apostrophe and plural form used correctly?

In which of the following sentences is the semicolon used correctly?

Identify if the following sentence contains a Fragment, Run On, Comma Splice error, or if it is correct.    Mark, Peter, and Stephanie all wanted to finish their exam, the others had no clue what time it started. 

When 320 mL of a magnesium chloride solution is placed in a beaker and the water is allowed to evaporate, 16.8 g of MgCl2 solid remains in the beaker.  What was the molarity of the original 320 mL of solution? Hint: molar mass (FWT) of MgCl2 is 95.20 g/mol. 

How many moles of NaCl must be added to a final volume of 550 mL to create a 1.80 M solution?

How much water (in mL) would you need to add to 125 mL of a 1.00 M NaCl solution to produce a 0.120 M solution. Hint:  Vwater = V2 (final volume) – V1 (initial volume)

A system absorbs 54.9 kJ of heat to the surroundings and 29.5 kJ of work is done on the system.   What is the value of

A system absorbs 22.4 kJ of heat to the surroundings and does 19.2 kJ of work on the surroundings.   What is the value of

Tears are typically more Hypotonic from?