Ask question

Ask question

All categories

andreev551 [17]

3 years ago

5

Whoever answers correctly I’ll give you a Brainly

2 answers:

LekaFEV [45]3 years ago

4 0

B. energy is released

Andre45 [30]3 years ago

3 0

Answer:

answer is B

Explanation:

You might be interested in

Sugar can be removed from a sugar water solution through dialysis.

Fantom [35]

Answer:

false

which I think

I am not sure

4 0

3 years ago

A group of scientists must complete a study, but they have

Mashutka [201]

<u>The </u><u>scientific community </u><u>may act somewhat on restricted government </u><u>financing</u><u> circumstances throughout two ways:</u>

Source for further money.
Adjust this same scale and complexity of the investigation.

<u>Source for further money:</u>

A researcher anyone who has restricted equipment and materials to finish an investigation might cooperate with certain other scientists as well as establish networking to exchange resources, thoughts, and behaviors for the survey's completion.

<u>Adjust this same scale and complexity of the investigation:</u>

To decrease costs, the researchers might measure the study up by decreasing the levels initially intended for the investigation.

Learn more:

brainly.com/question/5960697

3 0

3 years ago

Which systems help an organism maintain its structure and shape

alexira [117]

The skeletal system, the skeletal system are your bones which give suport to your body! :)

3 0

3 years ago

Read 2 more answers

26.42m Significant figure

Elan Coil [88]

Answer:

4 sig figs

Explanation:

There are 4 because they are all # 1 or above.

0 has special rules on whether or not it is significant.

0 being between two other sig figs no matter how far apart makes it a sig fig.

example: 101 is 3 sig figs

0 that is at the end of a non decimal number are not significant.

example: 110 is 2 sig figs

0 that are after a decimal are significant as long as they after another sig fig.

example: 1.000 and .1000 are both 4 sig figs

extra examples:

110.01 is 5 sig figs

110.1 is 4 sig figs

.0001 is 1 sig figs

5 0

4 years ago

249 g of potassium iodide, KI, is mixed with 496.5 g of lead(II) nitrate, Pb(NO3)2.

sveticcg [70]

<u>Answer: </u>The number of moles of excess reagent left is 0.750 moles

<u>Explanation:</u>

The number of moles is calculated by using the equation:

$\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}$ ......(1)

<u>For KI:</u>

Given mass of $KI$ = 249 g

Molar mass of $KI$ = 166 g/mol

Putting values in equation 1, we get:

$\text{Moles of KI}=\frac{249g}{166g/mol}=1.5mol$

<u>For </u> $Pb(NO_3)_2$ <u>:</u>

Given mass of $Pb(NO_3)_2$ = 496.5 g

Molar mass of $Pb(NO_3)_2$ = 331 g/mol

Putting values in equation 1, we get:

$\text{Moles of }Pb(NO_3)_2=\frac{496.5g}{331g/mol}=1.5mol$

The given chemical equation follows:

$2KI+Pb(NO_3)_2\rightarrow 2KNO_3+PbI_2$

By stoichiometry of the reaction:

If 2 moles of KI reacts with 1 mole of lead(II) nitrate

So, 1.5 moles of KI will react with = $\frac{1}{2}\times 1.5=0.75mol$ of lead(II) nitrate

As the given amount of lead(II) nitrate is more than the required amount. Thus, it is present in excess and is considered as an excess reagent.

Thus, KI is considered a limiting reagent because it limits the formation of the product.

Moles of excess reactant ( $Pb(NO_3)_2$ ) left = [1.5 - 0.75] = 0.750 moles

Hence, the number of moles of excess reagent left is 0.750 moles

8 0

3 years ago