Heat depends on A. Atmospheric pressure B. Particle speed only C. Number of particles D. Both speed and amount

I'm gonna assume you want to find how much mass of oxygen 4.95g of phosphorus reacts with

P4(s) + 502(8) --> 2P205(s)

We know that Phosphorus is polyatomic and Oxygen Gas is diatomic

Atomic mass of Phosphorus= 30.97g/mol

Atomic mass for Oxygen = 16g

4 * 30.97 = 123.88g

2 * 16 = 32g

Since there are 5 moles of oxygen: 5 * 32 = 160g

Ok, so 160g of oxygen will react 123.88g of Phosphorus

4.95g phosphorus burns with how much oxygen?

4.95 * 160g

 123.88g

= 6.4g of Oxygen