Answer:
3.
Explanation:
Hello,
In this case, it is convenient to write the chemical reaction as:

Which balanced turns out:

Thus the number that should be in front of the calcium sulfate is 3 in order to balance the reaction.
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Answer:
it's means two plural phenomenon and object or aspect known for through the sentence rather than by dot or intuition a temporal or spout temporal object of sensory experience as discussion from a nominal
Answer: 4Kcal
Explanation:
H= mcø
M=200g
C= 1 cal/g/°c
Ø= 40-20=20°c
H= 200*1*20= 4000calories= 4Kcal
<span>The strong bonds give graphite high boiling and melting points, while the weak bonds make graphite soft and flexible.</span>