When two or more substances combine, but each keeps it own properties,the new combination is called a (an)

Chemistry

1 answer:

Harman [31]3 years ago

7 0

The new combination is called a mixture.

In mixtures, since the substances are not chemically combined together, they still remain their own physical and chemical properties, and can be separated by simple physical methods such as filtration or distillation.

On the other hand, if the two or more substances are combined where they get new properties, the new combination will be called a compound. They cannot be separated by physical methods, but chemical methods such as heating or electrolysis.

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Kobotan [32]

The % yield of Hf is 91. 8%

calculation

% yield = actual mass/ theoretical mass x100
actual mass = 2.85 Kg

calculate the theoretical mass
by first write the equation for reaction

CaF2 +H2SO4 → 2HF + CaSO4
find the moles of CaF2 used
moles = mass/molar mass
mass = 6.05Kg = 6.05 x1000 =6050 Kg
molar mass of CaF2 = 40 + (19 x2) = 78 g/mol

moles= 6050/ 78 = 77.6 moles

by use of mole ratio between CaF2 to HF which is 1:2 the moles of HF is therefore = 77.6 x2 =155.2 moles of Hf

find the theoretical mass of HF = moles x molar mass ( 1 +19=20g/mol)

= 155.2 moles x 20 g/mol = 3104 grams = 3104 /1000 = 3.104 Kg

The % yield is therefore = 2.85 Kg/ 3.104 Kg x100 = 91.8%

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Explanation:

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