Benzene, a chemical used in the manufacture of many products, has a
density of 0.8765 g/cm3. What would be the mass in mg of benzene if the
volume is 0.342 mL?
A. 89.9 mg
B. 390 mg
C. 2560 mg
D. 3340 mg
E. 300 mg

E. 300 mg

Explanation:

To calculate the mass of benzene , we use the equation:

Given : Density of benzene =

Volume of benzene =    

mass of benzene = ?

Putting in the values we get :

   (1g=1000mg)

Thus the mass in mg of benzene is 300 if the volume is 0.342 mL

idk

explanation:

dasdad

"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"