Question

Определите массовую долю чистого K2CО3 в древесной золе, если 5 кг золы содержат 100 г K2CO3.

Answer 1

W(K2CO3)=mв-ва*100%/mр-ра=100*100/5000=2%

Answer 2

Calculating the Mass Fraction of K2CO3 in Wood Ash

To determine the mass fraction of pure K2CO3 in wood ash, we can use the given information that 5 kg of ash contains 100 g of K2CO3.

First, we need to convert the mass of K2CO3 to the same units as the total mass of the ash (5 kg).

Conversion of Units

To convert 100 g to kilograms, we divide by 1000: 100 g = 0.1 kg

Now, we can calculate the mass fraction of K2CO3 in the wood ash.

Calculating the Mass Fraction

The mass fraction of K2CO3 in the wood ash can be calculated using the formula:

Mass Fraction = (Mass of K2CO3 / Total Mass of Ash) * 100%

Substituting the given values: Mass Fraction = (0.1 kg / 5 kg) * 100% Mass Fraction = (0.1 / 5) * 100% Mass Fraction = 2%

Therefore, the mass fraction of pure K2CO3 in the wood ash is 2%.