Answer: a) 
Explanation:
As we know that,
where,
q = heat released = -600.2 J
= mass of iron rod =100 g
= final temperature =
= initial temperature = ?
= specific heat of iron = 
Now put all the given values in equation, we get
![-600.2J=100\times 0.452J/g^0C\times (25.0-T_{initial})^0C]](https://tex.z-dn.net/?f=-600.2J%3D100%5Ctimes%200.452J%2Fg%5E0C%5Ctimes%20%2825.0-T_%7Binitial%7D%29%5E0C%5D)
Therefore, the initial temperature of iron rod was
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First of all scientific evidence is anything that is gathered using the scientific method that supports a hypothesis can be considered. According to me, a good place to start evaluating is to look at whether the evidence was collected using good scientific principles.
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Answer:
5.56g of FeCl2 can be produced
Explanation:
To solve this question we must find the moles of each reactant. With the moles and the chemical equation we can find limiting reactant. With limiting reactant we can find the moles of FeCl2 and its mass as follows:
<em>Moles HCl:</em>
1.5L * (0.25mol / L) = 0.375 moles HCl
<em>Moles Fe -Molar mass: 55.845g/mol-</em>
2.45g * (1mol / 55.845g) = 0.0439 moles Fe
For a complete reaction of 0.375 moles HCl are needed:
0.375 moles HCl * (1mol Fe / 2mol HCl) = 0.1875 moles Fe
As there are just 0.0439 moles Fe, <em>Fe is limiting reactant</em>
<em />
1mol of Fe produce 1 mole of FeCl2, 0.0439 moles Fe produce 0.0439 moles of FeCl2. The mass is:
<em>Mass FeCl2 -Molar mass: 126.751g/mol:</em>
0.0439 moles Fe * (126.751g / mol) =
<h3>5.56g of FeCl2 can be produced</h3>
