How does the law of conservation of mass apply to this...

How does the law of conservation of mass apply to this reaction: C2H4 + 3O2 → 2H2O + 2CO2 ? A. Each element needs to be balanced. B. The law of conservation of mass has already been applied. There is an equal number of each element on both sides of the equation. C. Only the oxygen needs to be balanced. There are equal numbers of hydrogen and carbon. D. The equation needs to be balanced. There are fewer oxygen atoms in the equation than hydrogen or carbon.

Transcript

0:00 All righty.

00:01 So this question says, how does the law of conservation of mass apply to the following reaction? and so the law of conservation of mass says that mass is either neither created nor destroyed.

00:17 Rather, it transforms states in a closed system.

00:21 And so what that simply means is that the mass that you start with is going to equal the mass that you end with.

00:28 And so in order to be sure that this law is being upheld in a reaction, we need to make sure that the number of atoms in the reactants is equal to the number of atoms in the products.

00:42 So i have written out our reaction here.

00:48 And so we just need to make sure that both sides of the equation are balanced.

00:53 And what i mean by balance is once again that the number of atoms, is equal on both sides.

01:01 And so on the reactant side, which is the left side, we have carbon, hydrogen, and oxygen.

01:14 And on the product side, which is this side, the right side, we have carbon, hydrogen, and oxygen.

01:25 And this is good because we can see that there have been no other elements introduced into the system.

01:32 So this is good so far.

01:35 All right.

01:35 So now we just have to count the number of atoms of each element.

01:41 So let's start with.

01:43 It says we have a molecule of c2h4 and out front there's just this invisible one and it just shows that it's a molecule because if we didn't have a molecule then it wouldn't be listed...

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