I really need anyone's help in chemistry

[leena babsail]

In chapter 5 :
when do we use L 22.4 and when do we use STP 1 atm and
T=273 ??
and why in Example 5.4 used this equation V=N . V ??
and do they mean by putting no number before the compound that it is a 1 mol ??
please i need answers tommorow is our exam
thankss

[al-abqary]

as you wrote your questions in english
i will answer in english
first:- STP means that P=1atm
v=22.4
t=273
second:- i don't have chang book so i don't know
third:-yes
if the equation is
2H2+O2>>>2H2O

that means that 2 mol of H2 gives 2 mol of H2o
and 1mol of o2 gives 2mol of H2o

i hope that you will understand

[leena babsail]

mrra thankss .. !!
dony worry i understand now ..
another REQUEST
can u explain daltons low of partial pressures 4 me pleasE ?

[al-abqary]

dalton's low is very simple
it says that the total pressure=the sum of the partial pressures

for example in a container if you have a mixture of O2 with pressure 12
and H2 with pressure 50
and He with pressure 80 atm


so the total pressure will be=12+50+80=142 atm

i hope u understand



I am ready for any help

[leena babsail]

thaaaaaaaankss !!
wllah mrra mrrra thankss !!
god bless ya !