1. Oxygen gas has a pressure of 680 mmHg. What is the pressure in atmospheres?

If a sample of oxygen gas occupies 30.0 mL at -10°C and 680 mmHg, what is the volume at 10°C and 310 mmHg? Express your answer to two significant figures and include the appropriate units.

answer: -

reaction:

na + cl ⇌ nacl

balanced chemical equation:

na + 2cl ⇌ nacl2

sodium + clorine goes to form sodium chloride (table salt).

the product is nacl2.

and the reactants are na and cl.

(note: if you don’t know what ⇌ means, read below: -

⇌(double head arrow) means reversible reaction).

that's what i got you can count the number of atoms