The answer is x = 2.6 x 10^24. Hope this helps. :)
No screenshots of anything you need ?
Answer: produce hydroxide ions
Explanation:
Arrhenius acids are substances which dissociate in water to give hydrogen ions.
For example: 
is an Arrhenius acid.
Arrhenius bases are substances which dissociate in water to give hydroxide ions.
For example: 
is an Arrhenius base.
An Arrhenius base is best defined as produce hydroxide ions
In order to answer this, we mus know the data for the heat of combustion of propane. This is an empirical data that you can search online. The heat of combustion is -2220 kJ/mol. The molar mass of propane of 44.1 g/mol. The solution is as follows:
ΔH = -2220 kJ/mol (1 mol/44.1 g)(1000g/1kg)(20 kg)
<em>ΔH = -1006802.721 kJ or -1 GJ</em>
The water well begin to freeze and turn into soild. why? because the temperature of the the freezer is getting the water bottle cold so when that cold temperature hits that that bottle which has liquid in it so you should know that when liquid is into cold air it well so be soild so when you put the water bottle in the freezer it will be soild.
and also remember gas - liquid - soild gas change to liquid by hot air and liuid change to soild by clod air
hoped i helped
