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3 years ago

Please help, I’ll give brainliest!

Chemistry

2 answers:

UNO [17]3 years ago

7 0

Answer:

Explanation:

i looked it up

https://www.toppr.com/ask/question/the-stoichiometric-coefficient-of-n-o-3/

Aleksandr-060686 [28]3 years ago

5 0

It’s two bestie , i looked it up

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4. What is the molar mass of NO?

raketka [301]

Answer:

Nitrogen is a chemical element that has the symbol N and atomic number 7 and atomic mass 14.00674µ.

Explanation:

7 0

3 years ago

Aliyah marks a line on her driveway with a piece of chalk and another line 50ft away Then she stands with both feet at the line

Mariulka [41]

Answer:

Speed

Explanation:

Aliyah must have been trying to find her speed.

The speed is a measure of how fast an object or a body is and it is calculated by finding the ratio of distance with time. Mathematically,

speed = $\frac{distance}{time}$ with a unit of m/s.

<em>Hence, with the distance measured on the ground and Aliyah trying to find the time it will take her to cover the distance while running, she must have been trying to find how fast she can run, that is, speed. </em>

3 0

3 years ago

if you wanted to study the science of describing, naming, and classifying organisms, what would you study??

crimeas [40]

I think it would be taxonomy which is the the classification of something. Mostly organisms.

4 0

3 years ago

Calculate your percent yield for the bromination of cis-stilbene. [Note: Assume that stilbene is the limiting reagent. You must

evablogger [386]

Answer:

See explanation below

Explanation:

To calculate any percent yield of a reaction you need to provide, the theorical data and the experimental data, which you are not providing.

I will do an example with some values I found on another place to explain to you how to do it. You then, replace the data you have and follow the same procedure.

Let's suppose we have the following data of the stilbene:

density: 1.0111 g/mL

volume used: 0.3 mL

Molecular weight: 180.25 g/mol

Now, we use 0.3 mL of cis stilbene to do a reaction with acid and bromine to produce the 1,2-dibromo-1,2-diphenylethane.

The problem stated that the cis stilbene is the limiting reactant, therefore, the moles consumed of stilbene, would be the moles produced of the final product.

With the density let's calculate the mass of stilbene, and then, with the molecular weight, the moles:

d = m/V ---> m = d*V

m = 1.011 * 0.3 = 0.3033 g

moles = 0.3033 / 180.25 = 0.0017 moles

These obtained moles would be the moles of the final product too, because stilbene is the limiting reactant so:

moles of product = 0.0017 moles

Let's calculate the mass:

Molecular weight of 1,2-dibromo-1,2-diphenylethane = 339.8 g/mol

m = 0.0017 * 339.8 = 0.5776 g

This would be the theorical mass obtained in the experiment. Now, let's suppose we obtained a mass of 0.4158 g. This is the actual yield of the reaction, so the percetn yield would be:

%yield = Exp yield / theo yield * 100

Replacing:

%yield = 0.4158/0.5776 * 100

<em>%yield = 71.99 %</em>

This would be the %yield of the bromination. All you have to do now, is replace your theorical and experimental data and you should get to the final and accurate yield.

7 0

4 years ago

How many isomers are there with the formula c3h4? include both structural and geometric isomers?

sleet_krkn [62]

There are three possible Isomers for Molecular Formula C₃H₄. Isomers are;

1) Propyne

2) Propa-1,2-diene

3) Cyclopropene

Structures of all three isomers are given below.

There are no geometrical isomers for given molecular formula because geometrical isomers are formed in compounds containing double bond with at least two bulky groups at both sp² hybridized carbons. In given isomers, propyne does not contain any double bond, Propa-1,2-diene is symmetrical in nature while cyclopropene is a 3-membered ring. And for cycloalkenes there must be other groups attached to ring other than Hydrogen atom, hence cyclopropene does not contain any other group, so it can not show geometrical isomerism.

7 0

3 years ago