4 moles
64 grams of oxygen contains 4 moles
Answer : The amount of energy evolved during the reaction is, 
.
Solution : Given,
Mass of Al = 51.2 g
Molar mass of Al = 27 g/mole
First we have to calculate the moles of Al.
The balanced combustion reaction is,
From the given reaction, we conclude that
As, 2 moles of Al evolved energy = 
So, 1.896 moles of Al evolved energy = 
Therefore, the amount of energy evolved during the reaction is, .
<h3>
Answer:</h3>
2 H₂ + O₂ → 2H₂O
<h3>
Explanation:</h3>
- The equation that shows the conservation of atoms is the balanced one.
- In this case, the balanced equation is;
2 H₂ + O₂ → 2H₂O
Because it has 4 hydrogen atoms and 2 oxygen atoms on both sides of the equation.
- Chemical equations are balanced to obey the law of conservation of mass that requires the mass of the reactant to be equal to the mass of the products.
- Balancing chemical equations makes the number of atoms of each element in the equation equal, thus conserving the mass in the chemical reactions.
Answer:
A. Increasing the temperature of a chemical reaction speeds up the reaction rate.
Explanation:
The higher the temperature is, the faster a chemical reaction will happen. Food rots slower in refrigerators because it is cold, outside, they rot faster.
The sigma bonds are formed when orbitals overlap side by side and is related to covalent bond In ethylene the number of sigma bond are 5.
Reason, carbon has four carbon -hydrogen bond which form four sigma bond. The other sigma bond is between carbon=carbon bond thus ethylene has 5 sigma bond
