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Irina-Kira [14]
3 years ago
12

If a sample contains 21.2g N how many moles of N does it contain

Chemistry
1 answer:
tigry1 [53]3 years ago
8 0

Hey there!

The molar mass of nitrogen is 14.007.

Convert grams to moles:

21.2 ÷ 14.007 = 1.51

The sample containing 21.2g of nitrogen contains 1.51 moles of nitrogen.

Hope this helps!

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Answer:

4054 kcal of heat is released during complete combustion of 354 g of octane.

Explanation:

Heat of combustion of 1 mol of octane is 1.308\times 10^{3} kcal

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We know, no. of moles = (mass)/(molar mass)

So, 1.308\times 10^{3} kcal of heat is released during complete combustion of 114.23 g of octane.

So, amount of heat is released during complete combustion of 354 g of octane = (\frac{1.308\times 10^{3}}{114.23})\times 354  kcal = 4054 kcal

Hence 4054 kcal of heat is released during complete combustion of 354 g of octane.

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Clean Air  So B

Explanation:

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You have an unknownthat contains only one cation (it is oneof the twelve from this experiment).Your solution is colorless and od
algol [13]

Answer:

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Explanation:

This is the explanation by chemical reactions

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If the reaction takes place in a strong alkaline medium, lead hydroxide dissolves in excess of base

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Which is the first step in the titration process? clean and rinse the burette with water. read and record the initial burette vo
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Given are the steps in the titration process:

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The steps in the titration process is as follows:

1.) Clean and rinse the burette with water
2.) Rinse the burette with standardized base solution
3.) Fill the burette with standardized base solution
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3 years ago
Read 2 more answers
Hi I need help with the Lab report for the 'Flame Lab' in edge
Ludmilka [50]

Flame test is a qualitative test which is used to identify the metal and metalloid ion in the sample.

<h3>What is Flame Test ?</h3>

A Flame test is used to identify the metal and metalloid ion in the sample. Flame test is a qualitative test. Not every metal ion emit color when it is heated in the gas burner.

<h3>What is the Purpose of Flame test ?</h3>

The purpose of flame test is used to find the identities of ions in two solutions of unknown composition by comparing the colors they produce.

<h3>What are the material used ?</h3>
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Thus from the above conclusion we can say that Flame test is a qualitative test which is used to identify the metal and metalloid ion in the sample.

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