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svet-max [94.6K]
1 year ago
13

Select the isotopes from the following? A) 21/10 B) 22/10 C) 23/11 D)23/12

Chemistry
1 answer:
iren [92.7K]1 year ago
8 0

The isotopes of the same element in the given options are 21/10 and 22/10 (option A and B).

<h3>What is an isotope?</h3>

Isotopes are two or more forms of an element where the atoms have the same number of protons, but a different number of neutrons within their nuclei.

The above definition shows that atoms of isotopes will have the same atomic number but a different mass number.

Isotopes of the same elements have different number of neutrons and this causes the difference in mass numbers.

According to this question, 21/10 and 22/10 are isotopes of the same element because they have the same atomic number.

Learn more about isotopes at: brainly.com/question/11680817

#SPJ1

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find the total pressure of a gas that initially occupied 27 L at 32 degrees Celsius and 2.5 atm, if the final conditions are 12
yawa3891 [41]

Answer: Total pressure of the gas will be 0.716atm.

Explanation: We are given a gas having initial conditions as

V = 27L

T = 32°C = 305K

P = 2.5atm

As the gas remains same, number of moles of a gas will also be same for initial and final conditions. To calculate the number of moles, we use ideal gas equation, which is,

                                              PV=nRT                  .......(1)

where, R = gas constant = \text{0.08206 L atm }mol^{-1} K^{-1}

For calculating number of moles:

                          n=\frac{PV}{RT}

Putting the values of initial condition in this equation, we get

n=\frac{(2.5atm)(27L)}{\text{(0.08206 L atm }mol^{-1} K^{-1})(305K)}

n = 2.696 mol

Now, the final conditions are,

V = 88.0L

T = 12°C = 285K

n = 2.696 mol (calculated above)

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Again using equation 1, we get

                                 P=\frac{nRT}{V}

P=\frac{(2.696mol)(\text{0.08206 L atm }mol^{-1} K^{-1})(285K)}{88.0L}

P = 0.716atm.

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Answer:

Error.

Explanation:

An experiment can be defined as an investigation which typically involves the process of manipulating an independent variable (the cause) in order to be able to determine or measure the dependent variable (the effect).

This ultimately implies that, an experiment can be used by scientists to show or demonstrate how a condition causes or gives rise to another i.e cause and effect, influence, behavior, etc in a sample.

Cause and effect can be defined as the relationship between two things or events in which an occurrence one (cause) leads to the occurrence of another (effect).

Experimental error is a factor that can arise from incorrect use of measuring tools or malfunctioning equipment such as thermometer, barometer, multimeter, voltmeter, ammeter, vernier caliper, etc. This error usually causes test results to be inaccurate, incorrect and as such leading to wrong experimental conclusions.

Also, one common example of an experimental error is the error due to parallax.

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