Apiece of metal with a mass of 125 g is placed into a graduated cylinder that contains 25.00 ml of water, raising the water level to 56.00 ml. what is the density of the metal?

density=mass/volume

           =56-25

          =31

D=125/31

density=4.03

b because if you divide 125g with 31g/cm3 you get 4.03g/cm3

"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"

1.43 x 10^-11 j the guy commented the awnser just making sure u see it .