How many significant fgures do each of the folowing have: i. 0.368 i 06.4540 i 097.83 v 4857.169 . 0.42000 vi. 292.785854000 vii. 613 vii vii. 0.119 ix. 600 x. 0.5680

Explanation:

On order to solve this problem, we must first familiarize with the rules of significant figures:

Solution:

i. 0.368

    2

     Rule 2

ii.  06.4540

    5

    Rule 2

iii. 097.83

    4

    Rule 2

iv. 4857.169  

    7

    Rule 2

v. 0.42000

    5

    Rule 2

vi. 292.785854000

    12

    Rule 1 and 2

vii. 613

  3

   Rule 1

viii. 0.119

    3

    Rule 2

ix. 600

  1

    Rule 4

x. 0.5680

    4

    Rule 2

"you start with 15.67 g mgco3-xh2o, when heated and all the water is removed, you are left with 7.58 g mgco3 only.

therefore, you had 15.67 - 7.58 = 8.09g h2o  

moles of each :

7.58g mgco3 = ? moles = 7.58g / 83.4g/mole = 0.09moles  

8 09g h2o = ? moles = 8.09g / 18g/mole = 0.44moles  

molar ratio between the two by dividing both numbers by the smallest number :

0.09 / 0.09 = 1  

0.44 / 0.09 = 4.8  

mgco3-5h2o"