Science-it’s a pic with two questions. plz

Q5: 9;  Q6: 13

Step-by-step explanation:

Question 5.

The atomic mass is the number of protons plus the number of neutrons.

A = p + n

A= 4 + 5

A = 9

Question 6

In a neutral atom, the number of protons equals the number of electrons.

p = e

p = 13, so

e = 13

"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"

the correct answer to this question is 2