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3 years ago

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Lithium (Li) is in the 2nd row, so the 1st row is already full (1s2). Since lithium (Li) is in the 2nd row, the s-block, and the

1st column of that block, the electron configuration of lithium (Li) is

1 answer:

kozerog [31]3 years ago

4 0

The electron configuration of Lithium is 1s2 2s1

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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)

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2 years ago

An adult mosquitoes lifespan is about 16 days how many minutes is that

Delicious77 [7]

1 day = 1, 440 minutes
16 days = (1, 440 × 16) days = 23, 040 minutes

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3 years ago

The process in which a gaseous substance is converted into a condensed, more usable chemical substance is called

LiRa [457]

The process in which a gaseous substance is converted into a condensed, more usable chemical substance is called fixation

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2 years ago

Which of the following is a pure substance? Choose all that apply.

worty [1.4K]

Nickel is a pure substance

Rust is also a pure substance

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3 years ago

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16.6g CaCl2 dissolved in water and completely dissociates. The molality of chloride ions in 300g of water is

vova2212 [387]

Answer:

— The molality of chloride ions in 300g of water is. A) 1.00 molal. B) 0.500 molal. C) 0.0553 molal. D) 0.111 molal.

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2 years ago