In order to have a freezing point of −15.0°c means we need a depression in freezing point to be −15.0°c
we know that depression in freezing point is a colligative property which depends on molality as
depression in freezing point = Kf X molality
Kf = 1.86 °C/m
molality = moles of solute / mass of solvent in Kg
15 = 1.86 °C/m X molality
molality = 8.065
molality = moles of glycerol / mass of water in Kg
moles of glycerol = 8.065 X 928 X 10^-6
moles = 0.00748
moles = mass / molar mass
mass = moles X molar mass = 0.00748 X 92 = 0.688 grams = 688 mg
so this is the minimum mass required
Answer:
the coldness from the ice moved into the lemonade
Explanation:
because the ice was cold so when she pour the lemonade into the ice , the ice moved into the lemonade
Cation is Fe^+2 and anion is SO4^-2
Answer:
Explanation:
Precision relates to instruments of measurement or scale . A scale measuring upto cm is less precise than an instrument measuring upto mm .
Here the first measurement appears to have been taken with an instrument measuring up to metre and the second measurement appears to have been taken with an instrument measuring up to decimeter . So second measurement is most precise .
Third measurement is closest to the actual measurement that is 45.0 m , so it is most accurate measurement .
