In the formula XSO4 the symbol X could represent the element

1 answer:

5 0

<span>The hint here is to look at the anion of the compound. That is the polyatomic ion, sulfate or SO4. It has a charge of -2. Since the compound does not show any subscript, then it means that the cation must have a charge of +2 for it to be cancelled out. Hence, the elements that can represent X are the elements that have a +2 charge like Fe, Ca, Ba, Mg, Zn, etc.</span>

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Name the types of polymerization and the differences

Talja [164]

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Given that the freezing point depression constant for water is 1.86°c kg/mol, calculate the change in freezing point for a 0.907

melamori03 [73]

Answer : The correct answer for change in freezing point = 1.69 ° C

Freezing point depression :

It is defined as depression in freezing point of solvent when volatile or non volatile solute is added .

SO when any solute is added freezing point of solution is less than freezing point of pure solvent . This depression in freezing point is directly proportional to molal concentration of solute .

It can be expressed as :

ΔTf = Freezing point of pure solvent - freezing point of solution = i* kf * m

Where : ΔTf = change in freezing point (°C)

i = Von't Hoff factor

kf =molal freezing point depression constant of solvent. $\frac{^0 C}{m}$