Not 100% sure but I believe it is C.
The balanced chemical reaction is written as:
<span>2C2H2(g) + 5O2(g) → 4CO2(g) + 2H2O(g)
We are given the amount of acetylene to be used in the reaction. This will be the starting point for the calculations.
20.0g C2H2 ( 1 mol / 26.04 g) ( 5 mol O2 / 2 mol C2H2 ) ( 32 g / 1 mol ) = 61.44 g O2 is needed</span>
Explanation:
An Element is one and a compound is more than 2elements
Answer:
3) A single specific wavelength
Explanation:
When an electron returns to ground state, it has to emit a single photon.