Carbon dioxide is released into the atmosphere by _____.

1. denitrification
2. photosynthesis
3. fixation
4. respiration

Answer:

0.125 g

Explanation:

From the question given above, the following data were obtained:

Original amount (N₀) = 1 g

Number of half-lives (n) = 3

Amount remaining (N) =?

We can obtain the amount of the substance remaining by using the following formula:

N = 1/2ⁿ × N₀

N = 1/2³ × 1

N = ⅛ × 1

N = 0.125 × 1

N = 0.125 g

Thus, 0.125 g of the substance will remain after 3 half-lives.

Answer:

Approximately [tex]0.110\; \rm mol[/tex].

Explanation:

Balanced equation for this reaction:

[tex]\rm PCl_5 + 4\; H_2O \to H_3PO_4 + 5\, HCl[/tex].

Look up the relative atomic mass of [tex]\rm H[/tex] and [tex]\rm Cl[/tex] on a modern periodic table:

Calculate the molar mass of [tex]\rm HCl[/tex]:

[tex]\begin{aligned}&M({\rm HCl}) \\ &= (1.008 + 35.45)\; \rm g \cdot mol^{-1} \\ &\approx 36.46\; \rm g \cdot mol^{-1}\end{aligned}[/tex].

Calculate the number of moles of molecules in that [tex]20.0\; \rm g[/tex] of [tex]\rm HCl[/tex]:

[tex]\begin{aligned}n &= \frac{m}{M} \\ &\approx \frac{20.0\; \rm g}{36.46\; \rm g \cdot mol^{-1}} \approx 0.549\; \rm mol\end{aligned}[/tex].

In the balanced reaction, the coefficient of [tex]\rm H_3PO_4[/tex] and [tex]\rm HCl[/tex] are [tex]1[/tex] and [tex]5[/tex], respectively. The ratio between these two coefficients is:

[tex]\displaystyle \frac{n({\rm H_3PO_4})}{n({\rm HCl})} = \frac{1}{5}[/tex].

In other words, this reaction would produce five times as many [tex]\rm HCl[/tex] molecules as [tex]\rm H_3PO_4[/tex] molecules.

Calculation shows that in this question, approximately [tex]0.549\; \rm mol[/tex] of [tex]\rm HCl[/tex] molecules were produced. Calculate the number of moles of [tex]\rm H_3PO_4[/tex] molecules that were produced:

[tex]\begin{aligned}& n({\rm H_3PO_4}) \\ &= n({\rm HCl}) \cdot \frac{n({\rm H_3PO_4})}{n({\rm HCl})} \\ & \approx 0.549\; \rm mol \times \frac{1}{5} \approx 0.110\; \rm mol\end{aligned}[/tex].

Answer:

186 mL HCl

Explanation:

M1V1 = M2V2

M1 = 0.215 M HCl

V1 = ?

M2 = 0.800 M NaOH

V2 = 50.0 mL

Solve for V1 --> V1 = M2V2/M1

V1 = (0.800 M)(50.0 mL) / (0.215 M) = 186 mL HCl

Answer:

[tex]P_{He}=9.06torr[/tex]

Explanation:

Hello there!

In this case, we can identify the solution to this problem via the Dalton's rule because the partial pressure of helium is given by:

[tex]P_{He}=x_{He}P_T[/tex]

Whereas the mole fraction of helium is calculated by firstly obtaining the moles and then the mole fraction:

[tex]n_{He}=8.00g\frac{1mol}{4.00g}=2.00mol\\\\ x_{He}=\frac{n_{He}}{n_{He}+n_{Ar}} \\\\ x_{He}=\frac{2.00mol}{2.00mol+8.60mol}\\\\x_{He}=0.189[/tex]

Then, we calculate the partial pressure as shown below:

[tex]P_{He}=0.189 *48.0torr\\\\P_{He}=9.06torr[/tex]

Best regards!

Answer:

False

Explanation:

Negatively charged particles repel other negatively charged particles. Typically a negatively charged particle is electropositive and wants a positive molecule and/or cation (positive ion) to form a bond with. Negative molecules want positive molecules and vise versa.

Answer:

1. The balanced chemical reaction is:

[tex]HNO_3(aq)+NaOH(aq)\rightarrow NaNO_3(aq)+H_2O(l)[/tex]

2. The balanced chemical reaction is:

[tex]2HI(aq)+Sr(OH)_2(aq)\rightarrow SrI_2(aq)+2H_2O(l)[/tex]

Explanation:

Hello there!

In this case, according to the given chemical reactions, it is necessary to keep in mind the cations and anions are switched around as a result of the bonds rearrangement in these neutralization reactions; therefore, we can proceed as follows:

1. The balanced chemical reaction is:

[tex]HNO_3(aq)+NaOH(aq)\rightarrow NaNO_3(aq)+H_2O(l)[/tex]

Because all atoms are in the same amount at each side of the equation and the resulting salt is soluble.

2. The balanced chemical reaction is:

[tex]2HI(aq)+Sr(OH)_2(aq)\rightarrow SrI_2(aq)+2H_2O(l)[/tex]

Because all atoms are in the same amount at each side of the equation and the resulting salt is soluble.

Best regards!

Answer:

99 L

Explanation:

Step 1: Given data

Moles of nitrogen: 4.4 moles

Step 2: Calculate the volume occupied by 4.4 moles of nitrogen

The volume occupied by a gas depends on other conditions such as pressure  (P) and temperature (T). If we have this information, we can calculate the volume of the gas using the ideal gas condition.

P × V = n × R × T

Since the task doesn't inform the conditions, we can assume it is under standard pressure (1 atm) and temperature (273.15 K). At STP, 1 mole of any gas occupies 22.4 L.

4.4 mol × 22.4 L/1 mol = 99 L

Answer:

The answer is false

Explanation:

Because i am taking this safety test and i got that question right ong

Answer:

Bro what is this math or something

Explanation:

Answer:

A nail can rust when exposed to oxygen. the molecules of iron on the surface of the nail exchange atoms with the oxygen in the air and produce a new substance, the reddish brown ferrous oxide i.e rust.

Answer:

True

Explanation:

The statement having more moles of solute definitely means a higher concentration (molarity) solution is true.

Molarity is used to define concentration of any solution and it will be define as the no. of moles of solute present in per liter of solution and it is represented as:
M = n/V

From the equation it is clear that molarity of is directly proportional to the moles of the solute present in that. So, more no. of moles shows more concentration of solution.

Hence, given statement is true.

To know more about molarity, visit the below link:
https://brainly.com/question/26873446

The best answer for your question would be C. The total amount of all forms of energy stays the same.

First, let's eliminate the wrong choices. According to the Law of Conservation of Energy, you cannot create nor destroy energy, so you can eliminate choices A and B.

Also according to the Law of Conservation of Energy, the total amount of energy will always be the same. It may transform into different forms of energy.

To me, D doesn't sound very correct. For this one you can take an aducational guess, but I do not believe it would be D.

Hope this helps; have a great day!

Answer:

the answer is B hsjsjjsksks

Answer:

c.

Explanation:

I think???

Answer:

D

Explanation:

Answer:

there are three causes of fraud, namely, perceived pressure, perceive opportunities and rationalizations. Pressure can take many forms, including financial and employment pressure. A fraudster also may commit fraud when there is an opportunity, frequently related to weak internal control.

Explanation:

This study found that the most popular type of fraud is misappropriation of assets, including theft of cash and inventories. No significant differences were seen in terms of fraudster position, as they can come from both the lower and the executive level. However, the majority of the fraudsters come from the operational and sales department. This study also found that majority of the fraudsters in the case study were male, new employees and young adults. Their motivations to commit fraud include lack of understanding about fraud behaviour, opportunity to commit fraud and lifestyle and financial pressure.

(hope this helps can i plz have brainlist :D hehe)

Answer:

The freezing point depression can be calculated using the pure solvent freezing point and the molality of the solution.

At the freezing point, the vapor pressure of both the solid and liquid form of a compound must be equal.

The freezing point of a substance is the temperature at which the solid and liquid forms are in equilibrium.

To reattain equilibrium, the freezing point of the solute and solvent mixture is lowered relative to the original pure solvent.

Answer:

I think it is Greenland and Canada

Explanation:

The Taiga or boreal forest are present in the inland Canada, and Russia.

Taiga is coniferous forest, pines, spruce, and fur are common trees of this forest.

They are present in cold regions, and are adapted to survive in cold areas.

Different types of animals live in this forest, who are adapted to live in cold area, such as birds, rodents, bears, deer, moose, etc.

Siberian tiger is a native species of taiga forest, it is the world's largest cat.

Thus, the correct option is A, Canada, and E, Russia.

Learn more about Taiga forests

https://brainly.com/question/1462157

Answer:

C. 548mL

Explanation:

Attached is an image of the explanation. Hope this helps!

Combined gas law states that "the ratio of the product of pressure and volume and the absolute temperature of a gas is equal to a constant".

Temperature ,T₁ = 20⁰C = 20+273.15K = 293.15K

Temperature, T₂ = 40⁰C = 40+273.15K = 313.15K

According to combined gas law,

P₁V₁/n₁T₁ = P₂V₂/n₂T₂

Where, n is moles of substance

P is pressure

P and n are considered to be a constant.

Thus, V₁/T₁ = V₂/T₂

V₁ = V₂T₁/T₂

V₁ = ?,

V₂ = 585mL = 585mL x 293.15K/313.15K

V₁ = 548mL

Hence, the original volume of the helium gas is 548mL.

"Pressure is the force of all the gas particle/wall collisions divided by the area of the wall."

"Volume is the amount of space occupied by a substance."

"Temperature is the measure of hotness or coldness expressed in terms of any of several scales, including Fahrenheit and Celsius."

Know more about Combined gas law here

https://brainly.com/question/13154969

#SPJ2

Answer:

5 loaves of bread you could make.

5g yeast, 1.5L water, 2000g of flour

Explanation:

To solve this question, we must, as first, convert the moles of salt to grams (1mol NaCl = 58.44g/mol -Molar mass-). With this mass we can find the amount of breads we can use and the amount of the other ingredients:

Mass NaCl:

0.6mol * (58.44g / mol) = 35g salt

Loaves of bread:

35g salt * (1 loave / 7g NaCl) = 5 loaves of bread you could make

Other ingredients:

1g yeast * 5 = 5g yeast

0.3L H2= * 5 = 1.5L H2O

400g flour * 5 = 2000g flour

The number of 5 loaves of bread you could make.

And, 5g yeast, 1.5L water, 2000g of flour

Here we determine the following calculations:

For Mass NaCl:

0.6mol * (58.44g / mol) = 35g salt

Now

Loaves of bread:

= 35g salt * (1 loave / 7g NaCl)

= 5 loaves of bread you could make

And,

Other ingredients:

1g yeast * 5 = 5g yeast

0.3L H2= * 5 = 1.5L H2O

400g flour * 5 = 2000g flour

Learn more about water here: https://brainly.com/question/13011592

Answer:

mixture of colours answer

Answer:

Yes

Explanation:

Cause the student add wire To the flash and changed colour

Answer: Yes

Explanation: Because the color changed and one of the ways to see if a chemical reaction occured is color change.

Answer:

4.74 g H2

Explanation:

First, balance your reaction:

N2 + 3H2 --> 2NH3

Now convert 26.7 g NH3 to moles NH3 by dividing by its molar mass (17.031 g/mol). Then multiply by the mole ratio of 3 mol H2 for every 2 mol NH3 to get moles of H2. Finally multiply by the molar mass of H2 (2.016 g/mol) to get grams of H2.

26.7 g NH3 • (1 mol NH3 / 17.031 g NH3) • (3 mol H2 / 2 mol NH3) • (2.016 g H2 / 1 mol H2) = 4.74 g H2

Answer:

Fe₂O₃ is the limiting reactant.

7.57 g of MgO are formed.

Explanation:

First we convert the given masses of both reactants into moles, using their respective molar masses:

0.0626 moles of Fe₂O₃ would react completely with (3 * 0.0626 ) 0.188 moles of Mg. As there are more Mg moles than required, Mg is the reactant in excess; thus, Fe₂O₃ is the limiting reactant.

We now calculate how many MgO moles are produced, using the number of moles of the limiting reactant:

Finally we convert moles of MgO into grams:

Answer:

C

Explanation:

Energy stored in the bonds of chemical compounds. Chemical energy may be released during a chemical reaction, often in the form of heat; such reactions are called exothermic.

Answer:

The Answer is C.

Explanation:

Cause I'm smart

E⁣⁣⁣⁣xplanation i⁣⁣⁣⁣s i⁣⁣⁣⁣n a f⁣⁣⁣⁣ile

bit.[tex]^{}[/tex]ly/3a8Nt8n

Answer:

B or 0.1538

Explanation:

Remark

For every mol of NaN3 that decomposes, 3 mols of N2 are produced.

10000 mg = 10 grams

NaN3 = 23 + 3*14

NaN3 = 23 + 42

NaN3 = 65

So set up the following proportion

10 grams / 65 = x /1      Cross multiply

10 * 1 = 65 x                  Divide by 65

x = 10 / 65

x = 0.1538 moles   which is B I think

Answer:

bcs the oven heated it up?

Explanation: