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lisov135 [29]
3 years ago
12

What element has the lowest melting point

Chemistry
1 answer:
kap26 [50]3 years ago
8 0
Helium (He) has the lowest melting point of <span>-272.2 °C.</span>
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Consider the following intermediate chemical equations.
QveST [7]

Answer: 250 kJ

Explanation: According to Hess’s law of constant heat summation, the heat absorbed or evolved in a given chemical equation is the same whether the process occurs in one step or several steps.

According to Hess’s law, the chemical equation can be treated as algebraic expressions and can be added or subtracted to yield the required equation. That means the enthalpy change of the overall reaction is the sum of the enthalpy changes of the intermediate reactions.

P_4(s)+6Cl_2\rightarrow 4PCl_3  \Delta H_1=-2439kJ (1)

4PCl_5(g)\rightarrow P_4(s)+10Cl_2(g)  \Delta H_2=3438kJ (2)

Net chemical equation:

PCl_5(g)\rightarrow PCl_3(g)+Cl_2(g)  \Delta H=? (3)

Adding 1 and 2 we get,

4PCl_5(g)\rightarrow 4PCl_3(g)+4Cl_2 \Delta H_3=\Delta H_1+\Delta H_2=-2439+3438=1000kJ   (4)

Now dividing equation (4) by 4, we get

PCl_5(g)\rightarrow PCl_3(g)+Cl_2

\Delta H=\frac{\Delta H_3}{4}=\frac{1000kJ}{4}=250kJ   (4)

8 0
3 years ago
What is the charge is the ion when lithium reacts with chlorine
sladkih [1.3K]
When lithium reacts to chlorine it goes from having no charge to +1 charge, while chlorine goes from neutral to having -1 charge.
4 0
3 years ago
20 POINTS + BRAINLIEST, HELP
lakkis [162]
It’s 2.0 molecules.

Explanation:

It’s kind of obvious, haha.
6 0
3 years ago
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Can anyone help with Standard Cell Potential?​
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Answer:

its A

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Indicate whether each of the following indicates that a physical or chemical change has taken place when a piece of magnesium me
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c) Light is emitted when burned -Chemical Change

d) Turns to ash -Chemical Change

Explanation:

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