Which clue can be used to identify a chemical reaction as a decomposition reaction?
2 answers:
Answer:
The reaction has a single reactant
Explanation:
Decomposition reaction is a reaction in which an insoluble single compound is heated at a high temperature and decomposes into several products.
Typically, we may see decomposition of calcium carbonate producing calcium oxide and carbon dioxide, this is represented by the following reaction:
Another example would be decomposition of ammonium nitrite. Ammonium nitrite would decompose into nitrogen and water:
Notice that the two examples above share something in common: the two decomposition reactions have a single reactant.
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Given :
Number of He atoms, atoms.
To Find :
How many grams are their in given number of He atoms.
Solution :
We know, molecular mass of He is 4 g. It means that their are atoms in 4 g of He.
Let, number of gram He in atoms is x , so :
Therefore, grams of He atoms is 22.58 g .
Ok to answer this question we firsst need to fin the number of mol of Urea (CH4N2O). to do this we simply :
1 mol of urea =15/60.055 = 0.25mol
therefore 200g of water contain 0.25mol
the next step is to determine the malality of our solution in 200g of water, to do this we say:
200 g = 1Kg/1000g = 0.2kg
therefor 0.25mol/0.2Kg = 1.25mol/kg
and from the equation:
we know that i = 1
we are given Kf
b is the molality that we just calculated
therefore;
the solutions freezing point is -2.325°C
