Help Me Science Nerds!!

Con_Dog

New member

• Mar 12, 2009

• #1

How many kilograms of BPA are there in 5.0 moles of BPA?, molar mass is 228.29 g mol−1

rep for help!

 

4frnt.

Well-known member

• Mar 12, 2009

• #2

molar masse x number of moles


divided by 1000 to have kilograms

 

Con_Dog

New member

• Mar 12, 2009

• #3

wow im sad, thats easy

 

4frnt.

Well-known member

• Mar 12, 2009

• #4

lol i sucked hard in secondary 5 in my chemistry classes

 

Con_Dog

New member

• Mar 12, 2009

• #5

this is university chem online haha, but im in poli sci so i have an excuse!

 

Con_Dog

New member

• Mar 12, 2009

• #6

now i have to ask myself if bpa is denser than water

 

4frnt.

Well-known member

• Mar 12, 2009

• #7

lol you're lucky, i remember chemistry was way harder than this and i hated it!

 

4frnt.

Well-known member

• Mar 12, 2009

• #8

Con_Dog said:

now i have to ask myself if bpa is denser than water

Click to expand...

what is bpa? plastic?

water's molar mass and bpa's molar mass

the higher one is the denser

or same with volumetric mass

 

E

EV

New member

• Mar 12, 2009

• #9

Whenever doing a problem like this, use units until you get used to it.

g/mol * ?? = kg

So, you need to get rid of the mol on the bottom to be left with grams: g/mol * mol = kg *1000

OR, remember:

Molar Mass= grams / Moles


(BPA is bisphenol-A, used to harden plastics)

 

J-Slim

New member

• Mar 12, 2009

• #10

never did chem or physics

and i never intend to

 

4frnt.

Well-known member

• Mar 12, 2009

• #11

physics are nice.



but i hate chemistry with a passion!

 

Flix3r

New member

• Mar 12, 2009

• #12

Chem208 ftw. Easiest elective for sure.

 

Last edited: Mar 12, 2009

Cyclonicks

Well-known member

• Mar 12, 2009

• #13

ahhh du BPA.. consommé a chaque matin dans mes boissons énergie!!

 

lol_face3

New member

• Mar 12, 2009

• #14

CHEM 208! your doing part 2 for the paper right!?

post your answers! lol

 

Brat

Shop Representative

• Mar 12, 2009

• #15

Con_Dog said:

now i have to ask myself if bpa is denser than water

Click to expand...

Well, I think the density of BPA is 1.20 g/cm³ (according to wiki) and water is about 1.00 g/cm³ so it's more dense than water.

 

dragonfly

New member

• Mar 13, 2009

• #16

Now lets see... density...

Water is easy... H2O...

So density of H = 14.1 cm3/mol
Density of O = 14.0 cm3/mol

So the density of H2O is 42.2 cm3/mol

BPA is C15H16O2

So density of C = 5.3 cm3/mol

So 15*5,3+16*14,1+2*14 = 333.1 cm3/mol

Or so says the amazing table of periodic properties of the elements...

But really... we're talking about molecules... So unless your substances exist as some sort of "plasma". Screw my numbers...

I wouldn't know how to calculate the density of those substances from the data I have... Seems to be an empiric thing... I'm not that good of a chemis, however if someone would have the grace to explain...

 

Last edited: Mar 13, 2009

dcfan

Well-known member

• Mar 13, 2009

• #17

1.14 kg

 

TheDamned

New member

• Mar 14, 2009

• #18

4frnt_or_die said:

physics are nice.



But i hate chemistry with a passion!

Click to expand...

+1