HI, I need help with these multiple-choice questions URGENTLY!! WILL mark brainliest. (one is attached below) the rest are here.

1) The elements in which Group would most likely form ions that have a charge of -3?

Select one:

a. Group 1

b. Group 3

c. Group 15

d. Group 16

2) The elements in which Group would most likely form ions that have a charge of +1?

Select one:

a. Group 1

b. Group 2

c. Group 17

d. Group 18

the answer to your question is c.

if you read the house of usher you should know that the house was haunted

"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"

2b2t

explanation:

2b2t