I would say C but I’m not entirely sure
Answer:
Barium and sulpher are the elements that forms barium sulphide .
And its molecular fomula is BaS.
Explanation:
Standard enthalpy change of neutralization is the enthalpy change when 1 mole of water is produced by the reaction of an acid and a base under standard conditions.
Enthalpy change of neutralization:
- Every time enthalpy change of neutralization is calculated, one mole of water is produced.
- Heat is released when an acid and an alkali react, hence enthalpy changes of neutralization are always negative.
- The values are always quite comparable for reactions involving strong acids and alkalis, falling between -57 and -58 kJ mol-1.
- If the reaction is the same in each case of a strong acid and a strong alkali, the enthalpy change is similar.
Learn more about the Enthalpy of neutralization with the help of the given link:
brainly.com/question/15347368
#SPJ4
Answer:
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Explanation:
The unit <em>ppm</em> is parts per million.
In grams that is:
- grams of solute in 1,000,000 grams of solution
Here, the solute is 8.0mg of NaCl. That is 0.0080g.
The solution is 163 g.
Then, set a proportion:
0.0080g NaCl / 163g solution = x / 1,000,000g solution
- x = 1,000,000 g solution × 0.0080g NaCl / 163g solution
Round to two significant figures = 49 ppm ← answer
I think the answer is helium
