Atoms homework *earn lots of points*

Answer A)

1. Ne will have 10 protons and the charge of protons is positive.

2. Ne will have 10 neutrons and there is no charge on the neutrons.

3. Ne has 10 electrons and the electrons have a negative charge.

4. Atomic number of Ne is 10.

5. Atomic mass of Ne is 20.1797 u.

6. Name of the atom is Neon.

Answer B)

1. Hydrogen has no neutrons.

2. Atomic mass of carbon is 12 u.

3. Calcium has 20 protons.

4. Fluorine has 10 neutrons.

5. Potassium has 20 neutrons.

6. Oxygen has 8 protons.

Protons identifies an atom.

"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"