Where are most of the nonmetals found in the periodic table?. . A.. at the top. . B.. on the right side. . C.. in the bottom lef
1 answer:
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Answer:
1. Exothermic.
2. -1598 kJ.
Explanation:
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1. In this case, according to the reaction, we can infer that 799 kJ of energy are evolved (given off, released) it means that the enthalpy of reaction is negative as the reactants have more energy than the products; which means this is an exothermic reaction.
2. Here, as we know that the enthalpy of reaction is -799 kJ/mol, we can compute the q-value as shown below, considering the reacted 2 moles of solid iron:
Which means that 1598 kJ of energy are evolved when 2 moles of solid iron react.
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Explanation:
Density of the air ,d= 1.189 g/L
(a) Density of the evacuated ball
Mass of the ball ,m = 0.12 g
Volume of the ball =
D<d, teh evacuated ball will flaot in air.
(b) Density of the evacuated ball D = 0.214 g/L
Density of carbon dioxide gas =
Mass of the carbon dioxide gas :
Total density of filled ball with carbon dioxide gas:
The ball filled with carbon dioxide will not float in the air because total density of filled ball is greater than the density of an air.
(c) Density of the evacuated ball D = 0.214 g/L
Density of hydrogen gas =
Mass of the hydrogen gas :
Total density of filled ball with hydrogen gas:
The ball filled with hydrogen will float in the air because total density of filled ball is lessor than the density of an air.
(d) Density of the evacuated ball D = 0.214 g/L
Density of oxygen gas =
Mass of the oxygen gas :
Total density of filled ball with oxygen gas:
The ball filled with oxygen will not float in the air because total density of filled ball is greater than the density of an air.
(e) Density of the evacuated ball D = 0.214 g/L
Density of nitrogen gas =
Mass of the nitrogen gas :
Total density of filled ball with nitrogen gas:
The ball filled with nitrogen will not float in the air because total density of filled ball is greater than the density of an air.
f) Mass must be added to sink the ball = m
Density of ball > Density of the air ; to sink the ball.
m > 0.54584 g
For any case weight added to ball to make it sink in an air should be grater than the value of 0.54584 grams.