Answer:
Explanation
To get a mole of a compound just add up the molar mass
For example: O2
1 mole of oxygen is 16g
1 mole of O2= 32g
You can find the molar mass of each individual element on the periodic table of elements
solution:
You need to find the frequency, and they have already given you the wavelength. And since you already know the speed of light, you can use formula (2) to answer this problem. Remember to convert the nano meters to meters because the speed of light is in meters. 
It has a 1:2 ratio
If you look at the start of PbO2 it does not have a number so that is the one and if you look at 2H2O that has a 2 in front so that is where you get the 1:2 ratio
First let us determine the electronic configuration of
Bromine (Br). This is written as:
Br = [Ar] 3d10 4s2 4p5
Then we must recall that the greatest effective nuclear
charge (also referred to as shielding) greatly increases as distance of the
orbital to the nucleus also increases. So therefore the electron in the
farthest shell will experience the greatest nuclear charge hence the answer is:
<span>4p orbital</span>
Answer:
<h2>4 1 2</h2>
Explanation:
4 Li(s) + 1 O2(g) -> 2 Li2O(s)
