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2 years ago

An atom of nitrogen has seven electrons. Which diagram correctly respresents the arrangement of these electrons?

Chemistry

1 answer:

Studentka2010 [4]2 years ago

4 0

Answer:

Its B I just took the test and got a 100%

Explanation:

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Which highway run through comlumbus

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Answer:

Highway 22 ,GA 31820

Explanation:

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2 years ago

What are the radicals?Write their types with four examples.

polet [3.4K]

Answer:

<h3>A group of atoms behaving as a unit in a number of compounds. </h3>

Explanation:

<h2>Sorry for giving half answer only .I known this much only.</h2><h2>I hope U like my answer and my answer help u.</h2>

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2 years ago

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A student dissolved 5.00 g of Co(NO3)2 in enough water to make 100. mL of stock solution. He took 4.00 mL of the stock solution

Marianna [84]

Answer:

0.136g

Explanation:

A student dissolved 5.00 g of Co(NO3)2 in enough water to make 100. mL of stock solution. He took 4.00 mL of the stock solution and then diluted it with water to give 275. mL of a final solution. How many grams of NO3- ion are there in the final solution?

$Co(NO_3)_2(aq)\rightarrow Co^{2+}(aq)+2NO_3^{-}(aq)$

Initial mole of Co(NO3)2 $=\frac{mass}{molar mass}$

$=\frac{5.00}{182.94} \\\\=0.02733mol$

Mole of Co(NO3)2 in final solution

$=\frac{4.00}{100}\times 0.02733\\\\=0.04\times 0.02733\\\\= 0.001093mol$

Mole of NO3- in final solution = 2 x Mole of Co(NO3)2

$=2\times 0.001093\\\\=0.002186mol$

Mass of NO3- in final solution is mole x Molar mass of NO3

$=0.002186\times62.01\\\\=0.136g$

6 0

2 years ago

Combustion vapor-air mixtures are flammable over a limited range of concentrations. The minimum volume % of vapor that gives a c

DochEvi [55]

Combustion equation of n-hexane:

2C₆H₁₄ + 19O₂ → 12CO₂ + 14H₂O

a)
Assuming we have 100 moles of air,
Oxygen = 20.9 moles
n-hexane required = 20.9/19 x 2
= 2.2 moles

LFL = Half of stoichometric amount = 2.2 / 2 = 1.1
LFL n-hexane = 1.1%

b)
1.1 volume percent required for LFL

1.1% x 1
= 0.0011 m³ of n-hexane required

6 0

2 years ago

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I NEED HELP ASAP PLEASE

scZoUnD [109]

I think it’d be C. I’m not 100% if it is tho

8 0

2 years ago