An empty beaker is weighed and found to weigh 23.1 g. Some potassium chloride is then added to the beaker and weighed again. The
1 answer:
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Answer:
Substance is Aluminium
Explanation:
We are given;
Mass; m = 13.5 grams
Volume; V = 5 cm³
Formula for density is;
density = m/V
Density = 13.5/5
Density = 2.7 g/cm³
From the table attached, we can see that the element with a corresponding density of 2.7 is Aluminium
Answer:
774.265 kJ
Explanation:
Given an endothermic reaction in which 4 moles of production of ammonia requires 1170 kJ amount of energy . each mole of ammonia corresponds to 17grams. which means that 68 grams of ammonia production requires 1170 kJ amount of energy .
we are asked to find out the heat energy assosiated with the production of 45gms of ammonia let us calculate the heat energy assosiated with per gram production of ammonia that is one gram of ammonia synthesis reqires amount of energy .Then 45 gms require
amount of energy which is equal to 774.265kJ