0.04578 g of an unknown metal was reacted with excess HCl(aq) in a test tube to produce H2 gas. The H2 gas from the reaction was collected by the displacement of
water at 25.0°C and the barometric pressure of 755 torr. The volume of the H2 gas
under these conditions was measured to be 17.85 mL. The water vapor pressure at
25.0°C is 23.8 mmHg. The gas constant is 0.08205 atm-L/(mol-k). I atm = 760 torr =
760 mmHg.
Answer the following questions based on the above information:
1. What is the pressure of collected H2 gas?
2. How many moles of H2 gas were collected?
3. What is the molar mass of the unknown metal?
4. What is the identity of the unknown metal?
Write your answers below and label each answer clearly!

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 hope someone you