We will use the formula for freezing point depression :
but first, we need to get the molality m of the solution:
- molality m = moles of C2H5OH / mass of water Kg
when moles of C2H5OH = mass of C2H5OH/ molar mass of C2H5OH
= 11.85 g / 46 g/mol
= 0.258 moles
and when we have the mass of water Kg = 0.368 Kg
so, by substitution on the molality formula:
∴ molality m = 0.258 moles / 0.368 Kg
= 0.7 mol/Kg
and when C2H5OH is a weak acid so, there is no dissociation ∴ i = 1
and when Kf is given = 1.86 C/m
so by substitution on ΔTf formula:
when ΔTf = i Kf m
∴ ΔTf = 1 * 1.86C/m * 0.7mol/Kg
= 1.302 °C
Answer:Hence, the name of the NaOH is Sodium hydroxide.
Explanation:
In strong base NaOH is made up of three element sodium , oxygen and hydrogen.
NaOH dissociates is into cation and anion in its aqueous solution:
While naming the ternary compound:
- First write the name of cation present, here the cation is of sodium that
. - followed by space then write name of the anion , here anion present in a polyatomic anion that
, the name of this polyatomic anion is hydroxide.
Hence, the name of the NaOH is Sodium hydroxide.
<h2>Answer:</h2>
NH4+
<h3>Explanation:</h3>
Radicals are molecules or atoms which contain unpaired electrons. the exponent +4 represents 4 electrons in the outer shell which are unpaired
Yes. Your answer is a chemical change because a new SUBSTANCE liquid form will always be chemical.
