Ka for weak acids is ---> Ka= (X)²/ (initial- X)
initial= 0.0400 M
to find X, you can find the H concentration using pH
[H+]= 10^-pH
[H+]= 10^-1.80= 0.016 which is X
ka = (0.016)²/ (0.0400 - 0.016) = 0.011
Smashing a rock is the right answer :)
Answer:
morlecular element is oxygen
The organic compound that is <span>used for stored chemical energy and contains carbon, hydrogen, oxygen, and often phosphorous is called lipid.
Lipids are molecules which consist of fats, waxes, and other things and their function is to store energy, and make up cell membranes.
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I am 100% sure it’s oxygen
