Question 1 (1 point) (05.01 LC)
Which of the following best defines the molar mass of a substance? (1 point)
O a
Mass, in grams, of each particle of the substance
Ob
Total mass, in grams, of 100 particles of the substance
Ос
Mass, in grams, of the nucleus of the substance's atoms
d
Total mass, in grams, of all the particles in one mole of the substance

true

hope that

"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"