stoic order of operations

Question 1

if I have the mass of a CH2CH4 and want to find the moles what steps do I take?

Answer 1

mass/molecular mass= moles
1) find the molecular mass of CH2CH4
-look at periodic table
C=12 , H=1
hence the molecular mass is 12+2+12+4=30 g/mol

2) now we can complete the equation
mass/30=moles

DONE

Question 2

If I have the moles of a CH2CH4 and want to find the mass what steps do I take??

Answer 2

mass/molecular mass= moles
hence

mass = molecular mass x moles

1) find the molecular mass of CH2CH4
-look at periodic table
C=12 , H=1
hence the molecular mass is 12+2+12+4=30 g/mol

2) now we can complete the equation with 30 x moles= mass

DONE

Question 3

If I have the equation of CH4+ 302 –> CO2 + 2H2O

how many moles of CH4 do I have if I have six moles O2

Answer 3

answer=2

1)find the molar ratio between the molecule with the known moles and the molecule with the unknown moles you are trying to figure out

-the coefficient of O2 is 3 in this equation
-the coefficient of CH4 has no number so it is 1

2) now you get ur moles and times by the unknown/known

6 x 1/3 =2

that’s your answer

Question 4

what does ICE FC stand for

Answer 4

I=intial moles
C=change in moles
E=moles at equilibrium

FC= final concentration

Question 5

how to do an ICE FC question

Question 6

when to do an ICE FC question

Question 7

Q=m x c x (final temp - initial temp)

Answer 7

mass= mass of water (to convert ml to g times by 0.997)
c= 4.18

Question 8

how to go from kj/mol to kj/g

Answer 8

times by Mr

Question 9

how to go from kj/g to kj/mol

Answer 9

divide by Mr