What’s 13 in scientific notation
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The mass of water produced is 792 grams by the combustion of 568 grams of decane.
Given:
Combustion of 568 grams of decane with 2979 grams of oxygen.
To find:
The mass of water produced by combustion of 568 grams of decane.
Solution:
Mass of decane = 568 g
Moles of decane :
=
Mass of oxygen gas = 2976 g
Moles of oxygen gas:
=
According to reaction, 2 moles of decane reacts with 31 moles of oxygen, then 4 moles of decane will react with:
But according to the question, we have 93.0 moles of oxygen gas which is more than 62 moles of oxygen gas.
So, this means that oxygen gas is present in an excessive amount. Which simply means:
- Oxygen gas is an excessive reagent.
- Decane is a limiting reagent.
- Decane being limiting reagent will be responsible for the amount of water produced after the reaction.
According to reaction, 22 moles of water is produced from 2 moles of decane, then 4 moles of decane will produce:
Mass of 44 moles of water ;
792 grams of water is produced by the combustion of 568 grams of decane.
Learn more about limiting reagent and excessive reagent here:
12.7 grams of copper will be produced.
<h3><u>Explanation</u>:</h3>Copper is placed below zinc in the metal activity series. This means zinc can replace copper from its salt. Here zinc is added to the salt solution of copper sulphate. The reaction involved is
CuSO4 +Zn =ZnSO4 +Cu.
Zinc sulphate is soluble in the solution and rose red copper will be precipitated from the solution.
From the chemical equation we can see that 1 mole of zinc replaces 1 mole of copper. As no mass of zinc added is mentioned we will assume that excess of zinc is added.
Atomic mass of copper = 63.5
Atomic mass of sulphur = 32.
Atomic mass of oxygen = 16.
So molecular mass of copper sulphate = = 159.5.
So, mass of 1 mole of copper sulphate is 159.5 grams.
So, in 31.9 grams of copper sulphate, number of moles of copper sulphate present = = 0.2
In 1 mole of copper sulphate, 1 mole of copper is present.
So in 0.2 moles of copper sulphate, 0.2 moles of copper is present.
So mass of 0.2 moles of copper = = 12.7 grams