Mass water = 100 g solution - 10.5 g glucose => 89.5 g of H2O
Molar mass glucose => 180.1559 g/mol
Molality = moles glucose / kg solvent
( 10.5 / 180.1559 ) mol / ( 89.5 / 1000 ) kg =
0.0582 / 0.0895 => 0.650 mol/kg
hope this helps!
Mixtures are made up of two or more substances that are not chemically combined with each other. The properties of mixtures are listed below.
The components of a mixture each keep their original properties.
The separation of components can be easily done.
The proportion of the components is variable.
Explanation:
A chemical reaction is defined as the reaction in which bonds between the reactants either break or form which leads to the formation of a new substance.
For example,
So, when we drop a sodium metal into water then it produces a frizzing sound which shows the metal is reacting with water.
We know that when two aqueous solutions chemically react with each other then it may lead to the formation of an insoluble substance which is known as precipitate.
This means that formation of a precipitate is also a chemical reaction.
Thus, we can conclude that following are the statements which show evidence for a chemical reaction.
- Dropping sodium metal into water produces fizzing.
- Mixing two aqueous solutions produces a precipitate.
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