D. Should be correct- the other ones don’t make sense
C is correct.
Please vote my answer brainliest. thanks!
Answer:
Explanation:
From the 1 g sample you have:
0.546 grams of cobalt chloride
1-0.546=0.454 grams of water
Now:
1) The salt
Of the 0.546 g, 0.248 g are cobalt (Mr=58.9) and the rest id Cl (Mr=35.45):


Dividing:

So the molecular formula will be:

2) The water
The water's molecular weight is M=18 :

Bonding with the Co:

The complete formula of the hydrate:

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