Consider the reaction.

2 upper c (s, graphite) plus upper h subscript 2 right arrow upper c subscript 2 upper h subscript 2 (g).

standard enthalpies of formation
substance
dhf (kj/mol)
c2 h2 (g)
226.73
caco3 (s)
–1206.92
cao (s)
–635.09
co (g)
–110.525
co2 (g)
–393.509
h 2 o (i)
–285.8
h 2 o (g)
–241.818
c (s), diamond
1.895
c (s), graphite
0.0

based on the equation and the information in the table, what is the enthalpy of the reaction?
use delta h r x n equals the sum of delta h f of all the products minus the sum of delta h f of all the reactants..

–453.46 kj
–226.73 kj
226.73 kj
453.46 kj

Cis the answer ur welcome if i get it wrong u don't have to me

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. 

Idon’t know what the answer is i wish i could

Are there any options that could alot..