Question

Carbon dioxide gas is obtained from the fermentation of glucose. If 20.0 L of carbon
dioxide (at s.t.p) are collected, calculate the number of oxygen atoms present in this gas.

Answer 1

Answer:

5.48 x 10´23 atoms

Explanation:

Use PV = nRT

V = 20 L

R= constant = 0,08205746 L atm / (K mol)

stp means stantdard temperature and pression

T = 273 K

P =  0.987 atm

n = PV/RT = (0.987 atm)   x           (20 L)     = 0.88 moles

                    (0,082 Latm/(K mol)x 273 K

0.88 moles x $6.22 x 10^{23}$ molecules = 5.48 x 10´23 atoms