Answer:
to interpret laws
Explanation:
Answer:
To Interpet Laws
Explanation:
Answer:
C. Entropy
Explanation:
Heat is defined as the energy transferred from a hotter to a cooler body.
Kinetic energy is defined as the energy of a body in motion.
Entropy is a thermodynamic quantity that could be defined as a mesure of the disorder of a system. For a ordered crystal, entropy is zero.
Activation energy is defined as the minimum quantity of energy required to activate a particular chemical process.
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The heat of the reaction can be calculated using the enthalpy of formation. For a 53.99-g sample of iron, the heat of the reaction is approximately -798.9 kJ.
To calculate the heat of the reaction, we need to use the concept of enthalpy of formation. The enthalpy of formation of Fe2O3(s) is -826.0 kJ/mol. We can use this value as a conversion factor to find the heat produced when 1 mole of Fe2O3(s) is formed. Since we have a 53.99-g sample of iron, we can calculate the moles of iron and use the conversion factor to find the heat of the reaction.
The molar mass of iron (Fe) is 55.845 g/mol. Therefore, the moles of iron in the sample can be calculated as:
(53.99 g) / (55.845 g/mol) = 0.9662 mol
Now, using the conversion factor:
0.9662 mol Fe × (826.0 kJ/mol) = -798.9 kJ
Therefore, the heat of the reaction 4Fe(s) + 3O2(g) → 2Fe2O3(s) when a 53.99-g sample of iron is reacted is approximately -798.9 kJ.
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The problem is solved by first converting the given mass of Fe to moles, then determining the amount of Fe2O3 formed using the stoichiometry of the reaction. With the heat formation of Fe2O3 given, the heat released in the reaction is calculated to be -399.8 kJ, indicating an exothermic reaction.
To solve the given problem, we first need to calculate the number of moles of Fe in the 53.99-g sample. The molar mass of Fe is about 55.85 g/mol, so 53.99 grams will represent approximately 0.967 moles of iron. Given the reaction 4Fe + 3O2 → 2Fe2O3, the formation of 2 moles of Fe2O3 requires 4 moles of Fe; hence a ratio of 2:4= 0.5:1 is formed. So, from 0.967 moles of iron, we get 0.967*0.5 = 0.484 moles of Fe2O3 formed.
From the problem, we know that the heat of formation of Fe2O3 is -826.0 kJ/mol. Therefore, the heat of reaction or released heat from the formation of 0.484 moles will be 0.484*-826.0 kJ/mol = -399.8 kJ. Because the value is negative, this is an exothermic reaction, releasing heat.
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Answer: a) Yes
Explanation:
Halite has a vitreous luster that gives it a brilliant, glassy look. A vitreous luster is a nonmetallic luster. Minerals come in many different colors and many times the same mineral can be found in a variety of shades.
The will use less energy overall.
They will further science and technological development.
They will provide society with a product that is in short supply.
Answer : fluorescent bulbs help the environment as they use less energy overall
Explanation :
Fluorescent bulbs are energy efficient. They consume less electricity as compared to conventional bulbs. They also generate less heat.
In modern world, we are facing energy crisis. The non renewable energy sources are getting depleted. It is highly necessary that we should start using alternative energy sources such as non renewable energy sources more often.
Another way to reduce our energy consumption is to use gadgets which use electricity more efficiently. One example is fluorescent bulb over traditional incandescent bulbs.
Therefore we can say that fluorescent bulbs help environment by using less energy and by producing less heat.