Module 2 Chapter 1- Molar Calc (pt.2)

Question 1

define mole

Answer 1

the amount of any substanc containing as many particles as there are carbon atoms in exactly 12g of c-12 isotope

Question 2

what is avogadro constant, NA

Answer 2

the no. of atoms per mole of the c-12 isotope - 6.02x10^23

Question 3

eq. to calculate mole

Answer 3

mol= mass/ mr

Question 3

eq to calculate no. of atoms/ions/molecules

Answer 3

moles x 6.02x10^23

Question 4

what is the molar gas volume, Vm

Answer 4

the volume per mole of gas molecules at a stated temperature and pressure (RTP)

Question 5

eq of molar gas volume

Answer 5

no. of mols= volume (dm^3)/ 24.0

Question 6

what eq. is used when a gas isnt at RTP- called ideal gas eq.

Answer 6

pV=nRT

Question 7

whats the ideal gas constant, R

Answer 7

8.31 mol^-1 k^-1

Question 8

how to convert celcius to kelvin, K

Answer 8

temp in C + 273

Question 9

what is 1 atmosphere in pressure

Answer 9

101,000 Pa

Question 10

what assumptions are made about ideal gases when using eq

Answer 10

• random motion
• elastic collision
• negligible size
• no intermolecular forces

Question 11

define molecular formula

Answer 11

the actual no. of atoms of each element in a molecule

Question 12

define empirical formula

Answer 12

the simplest whole no. ratio of atoms of each element present in a compound