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3 years ago

What molecular formulas has the same empirical formula

Chemistry

1 answer:

wlad13 [49]3 years ago

5 0

Answer:, formaldehyde

Explanation:

each molecule of which consists of one carbon atom, two hydrogen atoms, and one oxygen atom, has the molecular formula CH2O, which is identical to the empirical formula of glucose.

If this helps.

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When 100 mL of 0.200 M NaCl(aq) and 100 mL of 0.200 M AgNO3(aq), both at 21.9 °C, are mixed in a coffee cup calorimeter, the tem

masya89 [10]

Answer:

There is 1.3 kJ heat produced(released)

Explanation:

<u>Step 1:</u> Data given

Volume of a 0.200 M Nacl solution = 100 mL = 0.1 L

Volume of a 0.200 M AgNO3 solution = 100 mL = 0.1 L

Initial temperature = 21.9 °C

Final temperature = 23.5 °C

Solid AgCl will be formed

<u>Step 2</u>: The balanced equation:

AgNO3(aq) + NaCl(aq) → AgCl(s) + NaNO3(aq)

AgCl(s) + NaNO3(aq) → Na+(aq) + NO3-(aq) + AgCl(s)

<u>Step 3:</u> Define the formula

Pressure is constant. → the heat evolved from the reaction is equivalent to the enthalpy of reaction.

Q=m*c*ΔT

⇒ Q = the heat transfer (in joule)

⇒ m =the mass (in grams)

⇒ c= the heat capacity (J/g°C)

⇒ ΔT = Change in temperature = T2- T1

Step 4: Calculate heat

Let's vonsider the density the same as the density of water (1g/mL)

Mass = volume * density

Mass = 200 mL * 1g/mL

Mass = 200 grams

Q= m*c*ΔT

⇒ m = 200 grams

⇒ c = the heat capacity (let's consider the heat capacity of water) = 4.184 J/g°C

⇒ ΔT = 23.5 -21.9 = 1.6°C

Q = 200 * 4.184 * 1.6 = 1338 .9 J = 1.3 kJ

There is 1.3 kJ heat produced(released)

Therefore, we assumed no heat is absorbed by the calorimeter, no heat is exchanged between the calorimeter and its surroundings, and the specific heat and mass of the solution are the same as those for water (1g/mL and 4.184 J/g°C)

7 0

3 years ago

When are atoms considered to be stable?

Sergio [31]

Answer:

Atoms are at their most stable when their outermost energy level is either empty of electrons or filled with electrons.

8 0

3 years ago

Pls help!!! ILL GIVE BRAINLIEST, 70 points + 10 more if not plagiarized ty ty (also for those who scam and do it for the points

sukhopar [10]

Answer:

What procedure did you use to complete the lab?

→Procedures that needs to be considered to complete the lab are- a thorough knowledge of lab assignments, knowledge about safety equipment, reviewing the MSDS of chemicals for lab experiment etc.

<h3>Explanation:</h3>

To be lab prepared one must follow these procedures-

1. One should have the knowledge of lab assignments to make the lab experiment easier.

2. To be aware about safety equipment and their uses in lab, like- the location of fire extinguisher in lab.

3. To know the steps of experiments to be performed

4. To fill notebook of lab with information regarding the experiment

5. One should review the data sheets of chemicals material safety.

6. To put on all the necessary dressings to perform experiment.

7. To have complete understanding about the experiment disposals.

7 0

2 years ago

Read 2 more answers

Sulfur hexafluoride, a dense gas, is held in two separate containers in a storage room at an atmospheric pressure of 755 mmHg an

dimaraw [331]

Explanation:

As it is given that both the given containers are at same temperature and pressure, therefore they have the same density.

So, mass of $SF_{6}$ in container- 1 is as follows.

5.35 mol x molar mass of $SF_{6}$

= 7.61 mol x 146.06 g/mol

= 1111.52 g

Therefore, density of $SF_{6}$ will be calculated as follows.

Density = $\frac{mass}{volume}$

density = $\frac{1111.52 g}{2.09 L \times 1000 ml/L}$

= 0.532 g/mL

Now, mass of $SF_{6}$ in container- 2 is calculated as follows.

4.46 L x 1000 mL/L x 0.532 g/mL

= 2372.72 g

Hence, calculate the moles of moles $SF_{6}$ present in container 2 as follows.

No. of moles = $\frac{mass}{\text{molar mass}}$

= $\frac{2372.72 g}{146.06 g/mol}$

= 16.24 mol

Since, 1 mol $SF_{6}$ contains 6 moles F atoms .

So, 16.24 mol $SF_{6}$ contains following number of atoms.

= $16.24 mol \times 6$

= 97.46 mol

Thus, we can conclude that moles of F atoms in container 2 are 97.46 mol.

7 0

3 years ago

. In an acid-base titration, a standard solution of 1.0 MHCl is added to a solution of potassium hydroxide (KOH). As the standar

Hitman42 [59]

Answer:

The pH decreases very quickly, more quickly than earlier or later in the titration.

I think because SA-SB titration have the straight line where the equivalence point is where pH change is very steep and fast. Also pH is gonna decrease because after equivalence point you have more acid then base.

Explanation:

6 0

3 years ago