It can be shown that matter is neither created nor destroyed in a chemical reaction by taking a critical look at the each atom in both sides of the reaction (reactant and product sides).
1 atom of Mg started the reaction and 1 atom is also present in the products.
8 atoms of O are present in the reactants and 8 is also present in the products.
4 H atoms are present in the reactants and 4 are also present in the products.
2 N atoms are present in the reactants and 2 are also in the products.
In other words, the total number of each atom that is present in the reactants are also present in the product. Nothing has been lost during the reaction, although, the forms of each atom might have changed.
More on the law of conservation of matter can be found here: brainly.com/question/20635180
Answer:
Coefficient = 3
Subscript for Mg = 1
Subscript for Cl = 2
Explanation:
Coefficient:
A coefficient is number before the chemical formula which tells the number of molecules take part in chemical reaction.
For example:
2H₂ + O₂ → 2H₂O
In this reaction 2 moles of hydrogen react with one mole of oxygen and produce 2 mole of water. The number 2, 1 and 2 are the coefficient.
In given formula 3MgCl₂ the number before the formula which is three is coefficient.
While the number written as subscript tell about the number of atoms of elements. e.g.in MgCl₂ two atoms of chlorine and one atom of magnesium are present in given formula. If only one atom of particular element is present then it is not written as subscript.
Answer:
32.4°C
Explanation:
Consider the following expression:
P•V/T =P'•V'/T'
Where P and P' are respectively the initial and the final pressure, V and V's are respectively initial and final volume, and T and T' are respectively initial and final temperature.
We know that the pressure cannot change, so it means that P = P'
We also know that the volume must be increased in 20%, and if we multiply the volume by 1.2 is like increase it in 20%, so we can write that V' = 1.2•V, and changing a little more we can write that V'/V = 1.2
So let's do some maths:
P•V/T = P'•V'/T'
T'•P•V/T = P'•V'
T'•P•V = P'•V'•T
T'=P'•V'•T/P•V
We know that P'=P so the division is equal to 1:
T'= 1•V'•T/V
We also know that V'/V = 1.2, so:
T' = 1.2•T
And we know the value of T, it's 27, so now we just have to solve it:
T' = 1.2•27
T' = 32.4°C
Endothermic is the absorption of heat, so Burning in most likely the answer.