Answer: 20.2
Explanation:
Mass of isotope 1 = 20
% abundance of isotope 1 = 90.5% =
Mass of isotope 2 = 22
% abundance of isotope 2 = 8.0% =
Mass of isotope 3 = 23
% abundance of isotope 3 = 1.5% =
Formula used for average atomic mass of an element :

Therefore, the average atomic mass of the element is 20.2.
The hydronium and hydroxide concentrations of a solution that is 5.0 x 10-3 M H2SO4 is 2.7.
pH= -log[H+] - (i)
10^-3=H2So4
H+= 2×10-3
here ,
h2so4 ——— 2[H+] + so4^2-
thus [H+]= 2*10^(-3) because hydrogen ion has two moles
pH= -log[H+]
pH= -log(2×10^-3)
pH= 3-log2
pH= 3-log2pH= 2.7
The pH is 2.7
<h3>What is pH?</h3>
PH is the degree of alkalinity and acidicity in a solution.
Therefore, The hydronium and hydroxide concentrations of a solution that is 5.0 x 10-3 M H2SO4 is 2.7
Learn more about pH from the link below.
https://brainly.in/question/9937410
5 moles because molarity signifies number of moles dissolved in One litre of water
A, the chloroplast is where photosynthesis occurs
Answer:
they are producers and they have means to keep themselves warm
Explanation:
I took test and saw answer.