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3 years ago

HELP MULTIPLE CHOICE QUESTION!!!! I HAVE A QUIZ!!!!

Chemistry

1 answer:

koban [17]3 years ago

7 0

Answer:

A) not for 100%

Explanation:

sorry if it's wrong

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How many grams of i2 are needed to react with 30.1 g of n2h4?

Nina [5.8K]

The reaction is,

H2S + I2 --------------> 2 HI +S

Molar weight of H2S = 34 g per mol

Molar weight of HI =128 g per mol

Molar weight of I2 =254 g per mol

Moles of H2S in 49.2 g = 49.2 /34 mol = 1.447 mol

So according to stoichiometry of the reaction, number of I2 mols needed

= 1.447 mol

The mass of I2 needed = 1.447 mol x 254 g

8 0

3 years ago

Read 2 more answers

A 32.65 g sample of a solid is placed a flask. Toulene, in which the solid is insoluble, is added to the flask so that the total

Sloan [31]

Answer:

098.79

Explanation:

5 0

3 years ago

Do you expect the O---O bond in H2O2 to be longer or shorter than the O---O bond in O2?

melomori [17]

Answer : The O-O bond in $H_2O_2$ will be longer than the O-O bond in $O_2$ .

Explanation :

In the $H_2O_2$ , the two oxygen atoms are bonded by the single bond and in $O_2$ , the two oxygen atoms are bonded by the double bond.

As we know, the bond strength of double bond is greater than the single bond.

And the relation between the bond strength and bond length is,

$\text{ Bond strength}\propto \frac{1}{\text{ Bond length}}$

That means the higher the strength, the shorter will be the bond length.

Hence, the bond length of single bond will be longer than the double bond.

The structure of given molecule is shown below.

8 0

3 years ago

Science.... <br> homework!

Leokris [45]

The answer to this question is 2 and 3

5 0

3 years ago

Consider the equation for the formation of water. 2h2 o2 right arrow. 2h2o what is the theoretical yield of h2o if 130 g of h2o

Montano1993 [528]

The theoretical yield is the reaction yield that measures the product of the reaction from the conversion of the limiting reagent. The theoretical yield is 160 gm.

Mass or the theoretical yield is the result of the multiplication of mole and the molar mass of the compound.

The reaction between hydrogen and oxygen is shown as,

$\rm 2H_{2} + O_{2} \rightarrow 2H_{2}O$

Moles of water is calculated as:

$\begin{aligned}\rm moles &= \rm \dfrac{mass}{molar\; mass}\\\\&= \dfrac{18}{2}\\\\&= 9\;\rm moles\end{aligned}$

The theoretical yield of water is calculated as:

$\begin{aligned}\rm \text{weight of water} &= \rm moles \times molar \; mass\\\\&= 9 \times 18\\\\&= 162 \;\rm gm\end{aligned}$

Therefore, option D. 160 gm is the theoretical yield of water.

Learn more about theoretical yield here:

brainly.com/question/918691

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2 years ago