What is the percent by mass of potassium in K3Fe(CN)6?16.96%
21.88%
25.53%
35.62%

Answers

Answer 1

Answer: The percent mass of potassium in K3Fe(CN)6 is 35.62%. The molar mass (Mr) of K3Fe(CN)6 is the sum of atomic masses (Ar) of its elements. Ar(K) = 39.1 g/mol, Ar(Fe) = 55.84 g/mol; Ar(C) = 12.01 g/mol; Ar(N) = 14.01 g/mol. Mr(K3Fe(CN)6) = 3Ar(K) + Ar(Fe) + 6Ar(C) + 6Ar(N) = 3 * 39.1 + 55.85 + 6 * 12.01 + 6 * 14.01 = 117.3 + 55.85 + 72.06 + 84.06 = 329.27 g/mol. There are 3 atoms of K, so total mass of K in K3Fe(CN)6 is: 3Ar(K) = 3 * 39.1 = 117.3 g/mol. In percents, this is: 329.27 : 100% = 117.3 : x. x = 100% * 117.3 : 329.27 = 35.62%

Answer 2

Answer:

Answer:

%35.62

Explanation:

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What is the number of pairs of electrons that are shared between the nitrogen atoms in a molecule of N2?(1) 1(2) 2(3) 3(4) 6

Consider the two facts below:Fact 1: Dissolved oxygen is one of the most
important nutrients needed by fish in the aquatic
environment to survive.
Which scenarios may be explained by the facts on
the left? Check all that apply.
ID There is more dissolved oxygen in colder
waters than in warm water.
IM
Fact 2: Unlike solids, whose solubility increases
with increasing temperature, the solubility of gases
generally decreases with increasing temperature.
IND
There is less dissolved oxygen in colder
waters than in warm water.
Fish life in the ocean is more abundant during
the seaons with warmer water than seasons
with cooler water
HII
If ocean temperatures rise, then the risk to
the fish population increases.
DONE W

Answers

Answer:

A. There is more dissolved oxygen in colder waters than in warm water.

D. If ocean temperature rise, then the risk to the fish population increases.

Explanation:

Conclusion that can be drawn from the two facts stated above:

*Dissolved oxygen is essential nutrient for fish survival in their aquatic habitat.

*Dissolved oxygen would decrease as the temperature of aquatic habit rises, and vice versa.

*Fishes, therefore, would thrive best in colder waters than warmer waters.

The following are scenarios that can be explained by the facts given and conclusions arrived:

A. There is more dissolved oxygen in colder waters than in warm water (solubility of gases decreases with increase in temperature)

D. If ocean temperature rise, then the risk to the fish population increases (fishes will thrive best in colder waters where dissolved oxygen is readily available).

Answer: the answers are A and D

Explanation:

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Acid precipitation can be traced back to the burning of fossil fuels.
a. True
b. False

Answers

The statement that ‘Acid precipitation can be traced back to the burning of fossil fuels.’ Is true. The answer is letter A. Burning of fossil fuels may emit harmful gases that is toxic to the atmosphere and the surrounding beings.

Final answer:

Acid precipitation is caused by the release of pollutants such as sulfur dioxide and nitrogen oxides when fossil fuels are burned. These pollutants combine with water in the atmosphere to form acids, which can fall to the earth as precipitation.

Explanation:

The statement in the question is True. Acid precipitation can indeed be traced back to the burning of fossil fuels. When we burn fossil fuels like coal, oil, and gas, they release pollutants into the atmosphere. These pollutants include sulfur dioxide and nitrogen oxides, which can combine with water in the atmosphere to form sulfuric acid and nitric acid. These acids can fall to the earth in the form of precipitation, such as rain, snow, or fog, hence the term 'acid precipitation'. This process can have harmful impacts on the environment, including pollution of bodies of water and damage to vegetation.

Learn more about Acid Precipitation here:

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How many grams of NH3 can be produced from 4.54 mol of N2 and excess H2?

Answers

First we make a Balanced Chemical Equation:

$N_(2) + 3H_(2) = 2NH_(3)$

Now we can solve using the Mole Ratio:

4.54 mol N2 × 2 / 1 × 17.04 g/mol NH3
= 154.72 g

If you need further clarification, feel free to comment.

Which list of elements from Group 2 on the Periodic Table is arranged in order of increasing atomic radius?(1) Be, Mg, Ca (3) Ba, Ra, Sr
(2) Ca, Mg, Be (4) Sr, Ra, Ba

Answers

1) Be, Mg, CaBe, Mg, Ca, Sr, Ba, Rb are increasing layers

According to the periodic table, as you go down a group, atomic radius increases due to increasing number of electron shells. Therefore, your answer (1) Be, Mg, Ca.

a beaker with water and the surrounding air are all at 24'C. after ice cubes are placed in the water, heat is transfered from

Answers

Heat is transferred from air to the ice cubes, so that's why ice cube melt.

The temperature of water in a container was 60 degrees Celsius. Ten minutes later, the water temperature was 35 degrees Celsius. What was the rate of cooling of the water?

Answers

Final answer:

The rate of cooling of the water is 2.5°C per minute, calculated by using the difference in temperature over the time interval and assuming a linear rate of cooling.

Explanation:

The rate of cooling of water is the change in temperature over time. If the temperature of water drops from 60 degrees Celsius to 35 degrees Celsius in ten minutes, we can calculate the rate by subtracting the final temperature from the initial temperature and then dividing by the time elapsed. The formula for the rate of cooling is:

Rate of cooling = (Initial Temperature - Final Temperature) / Time

In this case:

Rate of cooling = (60°C - 35°C)/10 minutes = 2.5°C per minute

This calculation assumes that the cooling process follows a linear rate, which might not be the case in real-world scenarios as the rate can change over time due to various factors such as the properties of the container, the environment, and the volume of water.