Identify the predominant intermolecular forces in each of these substances. 1. H2O
2. CaCl2
3. CH3CH(CH3)OH
4. CH4
5. NH3

H2O- hydrogen bonding

CaCl2- ion-ion interaction

CH3CH(CH3)OH- hydrogen bonding

CH4- dispersion forces

NH3- hydrogen bonding

Explanation:

Intermolecular forces are secondary bond forces that hold the molecules of a substance together in a given state of matter.

Intermolecular forces account for quite a number of the observed physical properties of a substance such as the boiling and melting point.

If a compound contains hydrogen atom bonded to a highly electronegative element, hydrogen bonding becomes the most dominant intermolecular force, e.g in water and ammonia.

For nonpolar molecules, dispersion forces are the most dominant intermolecular forces. In ionic substance, ion-ion interaction becomes quite prominent.

"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"

they vary. it used to be meat, grain, bread, candy, beverages, donuts, and fruits/vegetables. now they added exercise in.