Answer:
13. 8 hrs
12. 8.89 meters per second squared
11. -0.75 meters per second squared
Those are your answer i don’t know what 6 is though sorry. Have a good day
Answer: 
Explanation:
First we have to calculate the heat absorbed by bomb calorimeter
Formula used :
= heat absorbed by calorimeter = ?
= specific heat of = 10.69 kJ/K
= final temperature = 
= initial temperature = 
As heat absorbed by calorimeter is equal to the heat released by acetylene during combustion.
Thus 1.53 gram of acetylene releases heat of combustion = 258.7kJ
So, 26.04 g/mole of acetylene releases heat of combustion 
Therefore, the heat of combustion of acetylene is,
Answer:
17. Yes, it represents a chemical reaction. This is because new substances were formed from the original substance.
18. (a) Formation of new substances
(b) Evolution or absorption of large quantity of heat
(c)Change in mass of substances
Explanation:
17. In the model above, molecules of a compound of carbon and hydrogen (molecular formula is C2H6) combines with molecular oxygen (O2) to produce two new substances; a compound composed of two oxygen atoms and one carbon atom (CO2) and another compound composed of two atoms of hydrogen and one atom of oxygen (H2O). Since the new substances formed are completely different from the original substances, it a chemical reaction. Also, a large volume of heat would have been given off.
18. To determine if a chemical reaction has occurred, the following observations can be looked out for.
a. Formation of new substances different entirely from the original substances
b. Evolution or absorption of large quantity of heat during the change. Check whether the vessel containing the substances gets hotter or colder.
c. Change in mass of substances. Since new substances are formed in a chemical reaction, there is usually a significant change in mass of the products and reactants.
Answer:
Explanation:
Henry's law relates the solubility of a gas in a solvent to it's partial pressure above the solution. P=k*solubility, where P is the pressure and k is the Henry's law constant. The Henry's law constants are temperature dependent.
There's basically three steps here (I'll just talk about oxygen here, the procedure for nitrogen is analogous). You first need to calculate how much oxygen is dissolved at 25 C. This is what you need the room temperature Henry's law constant for. You can then plug the constant and partial pressure (.21 atm) into Henry's law to get the concentration, and that can be converted into amount since you know the volume of water (1.0 L).
Alright, next you need to calculate how much oxygen will be dissolved at 50 C. You can do this by first finding the Henry's law constant, which you can do since you know the solubility at 1.00 atm and can plug that into Henry's law (k*27.8 mg/L=1.00 atm), and then use that to figure out the concentration at a pressure of .21 atm. And then translate that to amount of oxygen.
So now you know how much oxygen is dissolved at 25 C, and how much oxygen will be dissolved in 50 C. So, obviously, the difference is how much oxygen is released; translate this into volume using the ideal gas law to figure out what the volume of that amount of oxygen is.
Be careful with units throughout, that may well be the trickiest part.
