Answer:
Explanation:
A bigger ice block is made up of more particles
( sorry if this doesnt help it really didnt make sence to me!)
Answer:
Explanation:
To know the temperature at which KCl dissolves in water we need to refer to the general solubility curves.
In the case of , of it will dissolve in of water at a minimum temperature of .
So, the the minimum temperature needed to dissolve 35 grams of KCl in 100 grams of water is .
Answer:
The percent abundance of oxygen-18 is 1.9066%.
Explanation:
The average atomic mass of oxygen is given by:
Where:
m: is the atomic mass
%: is the percent abundance
Since the sum of the percent abundance of oxygen isotopes must be equal to 1, we have:
Hence, the percent abundance of O-18 is:
Hence, the percent abundance of oxygen-18 is:
Therefore, the percent abundance of oxygen-18 is 1.9066%.
I hope it helps you!
Answer:
they lose their water
Explanation:
When exposed to air washing soda crystals lose their water of crystallisation and become amorphous. ∴ The phenomenon is called efflorescence.
Answer:
There should be added 24.33g of EDTA
Explanation:
EDTA + Ca2+ → Ca(EDTA)
MM of EDTA = 292.24g/mole
MM of Ca2+ =40g/mole
An aqueos waste contains 20 mg/L Calcium, and collects the waste in 44 gallon drums.
The concentration of Ca2+ ions = 20mg/L = 0.02g/L
We know 1 gallon = 3.785L
The mass of calcium ions is in 44 gallons
⇒44 gallons = 3.785 * 44 = 166.54 L
Since the aqueous waste contains 0.02g/L calcium
in 44 gallons or 166.54 L ⇒ 166.54 * 0.02g = 3.308g
MM of Ca2+ = 40g/mole
⇒40g of Ca2+ reacts with 292.24g of EDTA
⇒ (292.24/40 ) * 3.308g = 24.33 g
There should be added 24.33g of EDTA