Household bleach is an aqueous solution of sodium hypochlorite (NaClO). For a kinetics experiment, 4 mL of a 5% (w/w) bleach solution was diluted in a 100 mL volumetric flask. 6 mL of this diluted solution is added to 6 mL of dye in a reaction vessel. What is the concentration of bleach (in M) in the reaction vessel? Assume the density of the bleach solution is 1.11 g/mL.

Explanation:

Given Mass of  4mL of bleach solution = 4mL x 1.11 g/mL = 4.44gMass of NaClO in 4.44g beach solution = 0.05 x 100 / 4.44g =1.126gMoles of NaClO = mass /molar mass molar mass of NaClO = 74.44g/molmoles = 1.126g/74.44g/mol = 0.0151moles

Now when 6mL of this solution is taken,  moles of NaClO in this 6mL;

= 6mL x 0.0151moles /100mL = 0.000906moles

This is added to 6mL dye. Therefore, total volume of solution = 12mL total volume = 0.012Lhence, concentration of bleach (in M) in the reaction vessel ; number of moles/volume =  0.000906moles/0.012L= 0.0755M

The answer is c. 320 g

The answer to your question really depends on three things: how much water you have, how cold it is to start out, and how cold the things around it are. water actually freezes when it gets to 32 degrees fahrenheit (0 degrees celsius), but the time it takes to get there may be different.  let's start with the first. if you take two glasses, and fill one with a tiny bit of water, and the other about halfway, then put them both in the freezer, the one with less water will freeze first (you can try this at home, but i recommend using plastic cups and not glass ones).  now let's move on to the second part. let's say you have two glasses, and you fill one with really cold water that has been in the refrigerator, and the other with really hot water from the sink. if you put both of them in the freezer, the one that started out colder will freeze first.  for the third part, let's imagine that you have two glasses with the same amount of water in them, and the water is at the same temperature. imagine putting one outside on a really really cold day in georgia, and having a friend in alaska put one outside on the same day. since it would be so much colder in alaska, the glass of water there would freeze before yours.  so, if you took a tiny bit of really cold water in a glass, and put it outside on a cold day in alaska, it would freeze a lot faster than a big glass of hot water outside on a cold day in georgia.