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3 years ago

Which element has exactly ﬁve electrons in the highest principal energy level (the outer shell)?

Chemistry

2 answers:

aleksley [76]3 years ago

8 0

Phosphorus (P) has 5 valence electrons in its outer shell, meaning, it needs 3 more to become a stable element.

statuscvo [17]3 years ago

7 0

This question is asking for an element with 5 valence electrons. Just go to the row it is in (excluding transition metals) and count over.
The answer would be c. P

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Which molecule in plants cells first captures the radiant energy from sunlight?

melisa1 [442]

Answer:

c tell me if im wrong:)

Explanation:

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3 years ago

What is the atomic mass for this element?0,-3,6,3

Sedaia [141]

Answer:

Explanation:

Atomic number refers to the number of protons in the nucleus of the atom.

and since there are 3 protons, the atomic number is 3

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3 years ago

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aleksandrvk [35]

Answer:

la tercera caja (3rd box)

Explanation:

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2 years ago

the combustion of a sample butane, C4H10 (lighter fluid) produced 2.46 grams of water. how many moles of water formed

enyata [817]

$2C_4H_{10}+13O_2$ ⇒ $8CO_2 + 10H_2O$

$n= \frac{m}{M} = \frac{m}{2M(H)+M(O)}= \frac{2,46}{2*1,0+16,0} = 0,14mol$

So 0,14mol are formed.

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4 years ago

1. A sample of polystyrene is found to have a number-average molar mass of 89,440 g mol−1 . Neglecting contributions from end gr

Snowcat [4.5K]

Answer:

The weight-average molar mass of polystyrene is 134,160 g/mol.

Explanation:

Molar mass of the monomer styrene , $C_8H_8$ , M=104 g/mol

Given , number average molar mass of the polymer , M'= 89,440 g/mol

Degree of polymerization = n

$n=\frac{M'}{M}=\frac{89,440 g/mol}{104 g/mol}=860$

The weight-average molar mass = $M_{avg}=?$

Molar mass dispersity is ratio of weight-average molar mass to the number average molar mass of the polymer.

$\text{Molar mass dispersity}=\frac{M_{avg}}{M'}$

$1.5=\frac{M_{avg}}{89,440 g/mol}$

$M_{avg}=89,440 g/mol\times 1.5 = 134,160 g/mol$

The weight-average molar mass of polystyrene is 134,160 g/mol.

8 0

3 years ago