Colligative
properties calculations are used for this type of problem. Calculations are as
follows:<span>
</span><span>ΔT(freezing point) = -(Kf)m
</span>-20.0<span> = -1.86 °C kg / mol (m)
m = 10.75 mol/kg
</span><span>
10.75 mol C2H6O2 / kg water ( 1 L water ) ( 1 kg/L ) (62.07 g/mol )= 667.25 g
Hope this answers the question. Have a nice day.
</span>
D
Because of the OH substituent
Calcium has electrons in more energy levels than magnesium. The number of electron in calcium atom is 20 which means 4 energy levels. (2 electron in first shell+ 8 electron in second shell+8 electron in third shell+ 2 electron in fourth shell). While number of electron in magnesium atom is 12 which means 3 energy levels. (2 electron in first shell+ 8 electron in second shell+ 2 electron in third shell). Also the Calcium third energy level contains more electron than magnesium.
It's atomic number is 79 and it's atomic mass is about 196.967
Natural formation of lead occurs by radioactive decay of uranium and thorium through radon (222Rn). Four stable isotopes are known, 204Pb, 206Pb, 207Pb and 208Pb, the first three of which are used for estimating the ages of rocks. Lead compounds exist mainly in +2 or +4 oxidation states, the former being more common.