A 50.0 N force is applied to an object travels with a constant velocity of 20m/s, calculate

How many moles of each element are in this sample p2o3

iris [78.8K]

The sample P2O3 ia made P, phosphorus and oxygen elements.

One mole of P2O3 has 2 mole P and 3 mole O

Thus the molar ratio is 2:3

3 0

3 years ago

g You observed the formation of several precipitates in the Reactions in Solution lab exercise. Identify the precipitate in each

RUDIKE [14]

Answer:

For a: Lead iodide is a yellow precipitate.

For b: Barium sulfate is a white precipitate.

For c: Ferric hydroxide is a brown precipitate.

For d: Copper (II) hydroxide is a blue precipitate.

Explanation:

Precipitation reaction is defined as the reaction where a solid precipitate (solid substance) is formed at the end of the reaction. It is insoluble in water.

For the given options:

For (a):

The chemical reaction between KI and lead (II) nitrate follows:

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

The iodide of lead is generally insoluble in water. Thus, lead iodide is a yellow precipitate.

For b:

The chemical reaction between barium chloride and sulfuric acid follows:

$BaCl_2(aq)+H_2SO_4(aq)\rightarrow BaSO_4(s)+2HCl(aq)$

The sulfate of barium is insoluble in water. Thus, barium sulfate is a white precipitate.

For c:

The chemical reaction between NaOH and ferric chloride follows:

$3NaOH(aq)+FeCl_3(aq)\rightarrow Fe(OH)_3(s)+3NaCl(aq)$

The hydroxide of iron is insoluble in water. Thus, ferric hydroxide is a brown precipitate.

For d:

The chemical reaction between NaOH and copper sulfate follows:

$CuSO_4+2NaOH\rightarrow Cu(OH)_2+Na_2SO_4$

The hydroxide of copper is insoluble in water. Thus, copper (II) hydroxide is a blue precipitate.

6 0

3 years ago

Smh why do people always have to use fake profile pictures? Its not like anyone is gonna judge you it isnt facebook its a websit

agasfer [191]

Seriously though
people love to do that stuff .-.

7 0

3 years ago

_____ might be able to detect tumors based on its use of X-rays and ability to produce cross-sectional images of the brain.

MatroZZZ [7]

Answer: CAT (computerized axial tomography) scan

Explanation:

Computerized Axial Tomography (CAT) scan is an X-ray examination in which a computer generates images showing cross-section views of a patient's internal parts (brain, blood vessels and etc.)

CAT scan can identify normality and detect abnormalities (such as tumor and degenerated cells) in the internal organs and structures and hence, this information are used to guide other medical processes.

6 0

3 years ago

A pharmacist has a 12% solution of boric acid and a 20% solution of boric acid. How much of each must he use to make 80 grams of

Iteru [2.4K]

Answer:

He must use 50g of the 12% solution and 30 g of the 20% solution.

Explanation:

Call x the amount of 12% boric acid solution to be used.

The content of acid of that is: 0.12x

Since he wants to make 80 grams of solution, the amount of 20% boric acid solution to be used is 80 - x.

The content of acid of that is{ 0.20(80 - x).

The final solution is 15% concentrated.

The content of boric acid of that is 0.15 × 80 g.

Now you have can write your equation:

$0.12x+0.20(80-x)=0.15\times 80$

Solve:

$0.12x + 16 - 0.20x=12\\\\-0.08x=12-16\\\\0.08x=4\\\\x=4/0.08\\\\x=50$

That is 50 grams of the 12% solution of boric acid.

Calculate the amount of the 20% solution of boric acid:

$80-x=80-50=30$

That is 30 grams.

Then, he must use 50g of the 12% solution and 30 g of the 20% solution.

5 0

3 years ago