Explanation:
The given data is as follows.
Heat of vaporization (
) = 45.4 kJ/mol
Specific heat (
) = 0.903 
Let us assume the alcohol given is 
and its mass is 1.12 g. Also, mass of aluminium block is 73.0 g.
First, calculate the moles of alcohol () as follows.
No. of moles alcohol = 
= 
= 0.0186 mol
So, heat absorbed by the alcohol (
) = heat lost by aluminium (
)
= 
12.71 = 
Thus, we can conclude that the final temperature of the block is 12.3^{o}C[/tex].
Think of it this way: it is a distribution problem in which you are multiplying the 2 on the outside with each element in the parentheses. Oxygen does not have a number in front of it, so put an imaginary one in front of it to help you. Do the same with Hydrogen since it doesn't have a number in front of it either. Now you know that hydrogen has one ion and oxygen has one... but you must now multiply each of the elements' ions by two. You should now know that Oxygen has 2 ions in Calcium Hydroxide and that there are also 2 ions of Hydrogen in Calcium Hydroxide. Does this make sense?
The correct answer is the second option; sodium (Na) and potassium (K.)
Both sodium and potassium have the same number of valence electrons.
Answer:
A. There were new technologies and new innovations to drive the sale of goods, since people could afford them
Explanation:
Answer:
Calcium reacts with Oxygen to form Calcium Oxide
Explanation:
Reactant: Calcium reacts with Oxygen to form Calcium Oxide
Products: Calcium + Oxygen
Chemical equation: Ca + 02> CaO
