moles and ram

Question 1

what is a mole?

Answer 1

a molecular mass of substance dissolved in 1dm3 (cubed) of water

Question 2

give an example of one mole

Answer 2

HCL (1 H=1
(1 CL= 35.5)
add the two together=36.5 (one mole)

Question 3

if the molecular mass came to 73 g, how many moles would their be?

Answer 3

2 moles (doubled 35.5)

Question 4

If the molecular mass came to 18.25 how many moles would their be?

Answer 4

0.5 moles (half 35.5)

Question 5

what is the triangle used for calculating moles?

Answer 5

moles= mass/MR
which is moles
mass Mr

Question 6

How much NaOH would be needed to make 0.25 moles of NaOH?

Answer 6

Mass=moles/MR
0.25x 1Na=23
          1O=16
          1H=1
0.25x40= 10g

Question 7

Calculate the number of moles in 9.8g of H2SO4 (small 2 and 4)

Answer 7

moles=mass/MR
9.8/ 2H=2
       1S=32
       4O=64
9.8/98= 0.1 moles