B

The geocentric theory was once accepted as an explanation of how objects were positioned in our solar system. Which statement be

dusya [7]

Answer: c

Explanation:

4 0

3 years ago

According to the following reaction, how many grams of potassium sulfate will be formed upon the complete reaction of 23.8 grams

Alexxandr [17]

<u>Answer:</u> The mass of potassium sulfate that can be produced is 73.88 grams

<u>Explanation:</u>

To calculate the number of moles, we use the equation:

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

<u>For KOH:</u>

Given mass of KOH = 23.8 g

Molar mass of KOH = 56.1 g/mol

Putting values in equation 1, we get:

$\text{Moles of KOH}=\frac{23.8g}{56.1g/mol}=0.424mol$

The chemical equation for the reaction of KOH and potassium hydrogen sulfate follows:

$KHSO_4+KOH\rightarrow K_2SO_4+H_2O$

As, potassium hydrogen sulfate is present in excess. It is considered as an excess reagent.

KOH is considered as a limiting reagent because it limits the formation of product.

By Stoichiometry of the reaction:

1 mole of KOH produces 1 mole of potassium sulfate

So, 0.424 moles of KOH will produce = $\frac{1}{1}\times 0.424=0.424moles$ of potassium sulfate

Now, calculating the mass of potassium sulfate from equation 1, we get:

Molar mass of potassium sulfate = 174.26 g/mol

Moles of potassium sulfate = 0.424 moles

Putting values in equation 1, we get:

$0.424mol=\frac{\text{Mass of potassium sulfate}}{174.26g/mol}\\\\\text{Mass of potassium sulfate}=(0.424mol\times 174.26g/mol)=73.88g$

Hence, the mass of potassium sulfate that can be produced is 73.88 grams

8 0

3 years ago

50 J of work was done on a system, as a result of which 29 J of heat energy was removed from it. How would this affect the inter

alexandr402 [8]

Answer:

Work done=50J

Heat removed=29J

Now

$\\ \sf\longmapsto \Delta E=-50+29$

$\\ \sf\longmapsto \Delta E=-21J$

Hence the internal energy would decrease by 21J

Option B is correct

7 0

3 years ago

Read 2 more answers

During the phosphatase experiment you will use a 1% w/v of phenolphthalein di-phosphate (PPP). How much PPP do you need to make

MrMuchimi

Answer:

To make 500 mL of a solution of PPP 1% w/v you need 5g

Explanation:

A percent w/v solution is calculated with the following formula using the gram as the base measure of weight (w):

% w/v = g of solute/ mL of solution × 100

A 1% w/v means that you have 1 g of PPP per 100 mL of solution

Thus, if you need to make 500 mL of solution you will need 5 g of PPP.

I hope it helps!

7 0

3 years ago

Describe the population density located along the tectonic plate boundary known as the Ring of Fire and the potential effect tha

pshichka [43]

Population density is the number of specific organisms living in a particular area. The tectonic plate movements in the Ring of Fire area can cause volcanic eruptions and earthquakes.

<h3>What are tectonic plates?</h3>

Tectonic plates are the parts of the crust and the mantle of the earth layer that is also called the lithosphere plate. They are not stationary and have slight movements on the mantle which comprises the hot lava.

The movement of these tectonic plates in the area of the Ring of fire causes the eruption of the lava and disrupts the crust causing an earthquake. This consequence affects the life habiting them.

Learn more about tectonic plates here:

brainly.com/question/11840787

#SPJ1

4 0

2 years ago