<h2>
Answer:</h2>
CH4 + 2O2 → CO2 + 2H2O
<h2>
Explanation:</h2>
10 grams of methane reacts with 40g of oxygen in the air. This means that mass from the oxygen in the air is also present in the carbon dioxide, so the mass can appear to increase, whereas in reality it is the mass of the oxygen that has caused the increase.
This reaction obeys the law of conservation of mass. Even though it may to appear so until balanced, all reactions follow the law.
Answer:
20cm^2
Explanation:
Here, Density= Mass/ Volume
=100/5
= 20 cm^2
Electrons orbit in orbitals (s, p, d, f).
Technically, the number of orbitals extend to infinity, but the effective nuclear charge decreases as the distance increases.