March 31, 2015

Homework Help: chem

Posted by bex on Saturday, February 3, 2007 at 3:16pm.

hi can anyone help

how do i determine the molecular formular of the oxide of arsenic in its in its gaseous state

the answer i got was 17.8 gl -1
for the density,

which law do i use is it boyles law or charles law


A mol of a gas occupies 22.4 L at STP. If it is 17.8 g/L at STP, then.

molar mass = 17.8 g/L x 22.4 L/mol = ??

If it isn't at STP, then change it to STP using PV = nRT.

where do you get the figure 22.4 as i have tried to figure it out

That is the volume occupied by a mole of any gas at STP. Most of us have that memorized; however, it can be calculated from PV=nRT.
STP is 1 atm (that goes for P), V is what you solve for, place 1 for n (# mols), R is 0.08206 (a constant) and T is 273.15 Kelvin (the T in STP). V will calculate to be 22.414

There may be an easier way to solve for the molecular formula. Why don't you post the entire problem?

thank you for that
i set it out like this

v = 1 x 0.08206 x 273.15
v = 22.414689
v = 22.41

what is the symbol at the end is it g as im not to sure
can you advise

Answer this Question

First Name:
School Subject:

Related Questions

chem - how is the oxide of arsenic worked out when its in its gas state please ...
chem - Urgent, please help - 0.702g arsenic combines with 0.225g of oxygen to ...
chemistry - Hi, Is the molecular formula different when it is in a gaseous state...
chemistry - what is the molecular formula of oxide of arsenic in its gaseous ...
chem - the root mean square speed of a certain gaseous oxide is 493 m/s at 20 C...
Chemistry - I need to work out the density of the gaseous oxide of arsenic at ...
chemistry - How do I calculate the mas of oxygen that combines with one mol of ...
Chemistry - Please could you tell me if I am going in the right direction. I am ...
chemistry - I need to know the molecular formula of oxide of arsenic when in its...
science - an oxide of arsenic = 0.927g 76% arsenic and 24% oxygen calculate the ...