CHEMISTRY HIGH SCHOOL

given that the molar mass of H2O is 18.02g/mol, how many liters of propane are required at STP to produce 75 g of H2O from this reaction?

Answers

Answer 1

Answer:

C₃H₈ + 5O₂ = 3 CO₂ + 4 H₂O

44.1 g ----------- 4* 18.02 g

? g --------------- 75 g

mass of C₃H₈ = 75 * 44.1 / 4 * 18.02

mass of C₃H₈ = 3307.5 / 72.08

= 45.886 g of propane

number of moles:

45.886 / 44.1 = 1.0404 moles

1 mole --------- 22.4 L ( at STP )
1.0404 moles ----- ?

v = 1.0404 * 22.4 / 1

v = 23.304 L

hope this helps!

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What does the number 84 in the name krypton-84 represent?b. Atomic number c. Mass number d. Twice the number of protons
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How many atoms are in 0.05 moles of xenon gas at STP?2.2 x 10^23

3.0 x 10^22

6.0 x 10^23

3.0 x 10^24

Answers

Answer: Option (b) is the correct answer.

Explanation:

According to the mole concept there are $6.022 * 10^(23)$ atoms present in 1 mole of a substance.

Mathematically, 1 mole = $6.022 * 10^(23)$ atoms or molecules

Therefore, number of atoms present in 0.05 moles of xenon are as follows.

$0.05 * 6.022 * 10^(23)$

= $0.3011 * 10^(23)$ atoms

or, = $3.0 * 10^(22)$ atoms

Thus, we can conclude that there are $3.0 * 10^(22)$ atoms present in 0.05 moles of xenon gas at STP.

To convert moles to atoms, multiply moles by Avogadro's number:
(0.05mol Xe)(6.02x10^23 atoms) = 3.0x10^22 atoms Xe

An unstable nucleus loses the most mass if the nucleus emits(1) an alpha particle (3) a positron
(2) a beta particle (4) a gamma ray

Answers

The correct answer is option 1. An unstable nucleus loses the most mass if the nucleus emits an alpha particle. This type of electromagnetic radiation has the largest mass among the radioactive particles. When this particle is emitted from a nucleus, it loses two protons and two neutrons therefore large amount of mass is lost.

Need help on this
Question

Answers

Answer:

The answer is D

What is the difference between periods and groups on the periodic table?

Answers

Periods are rows horizontally along the periodic table whereas groups are vertical columns down the periodic table.
Elements in the same group react similarly. E.g. the group 1 metals (found in the first column of the periodic table) react readily with air and water (this is the similarity) but these reactions become more vigorous / explosive as you go down the group (this is why they are similar but not the same). This is because elements in the same group have the same number of electrons in their outermost energy level (and electrons are responsible for how an element reacts)
Elements in the same period of the periodic table have the same number of inner most (also known as 'main') energy levels so have the same amount of electron shielding.

What is the structure of a krypton -85 atom?

Answers

Like all other krypton atoms, krypton-85 has a unique structure determined by its atomic number and mass number.

Krypton's atomic number is 36, which indicates that it has 36 protons in its nucleus. Krypton-85 is a radioactive isotope of krypton and has 85 nucleons (protons and neutrons) in its nucleus. Its mass number is 85.

An atom of krypton-85 has the following electrical structure:

1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶

The krypton-85 atom has 36 electrons spread over various electron shells and orbitals in this electron configuration.

Learn more about krypton-85, here:

brainly.com/question/10453815

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36 electrons, 36 protons, 49 neutrons

:)

Which pair below describes isotopes of the same element? A) an atom with 6 protons and 8 neutrons - an atom with 8 protons and 6 neutrons
B) an atom with 6 protons and 6 neutrons - an atom with 6 protons and 7 neutrons
C) an atom with 8 protons and 8 neutrons - an atom with 7 protons and 8 neutrons
D) an atom with 7 protons and 6 neutrons - an atom with 6 protons and 6 neutrons

Answers

Answer: The correct answer is Option B.

Explanation:

Isotope is defined as the chemical specie which belong to the same element but differ in their molecular mass.

The isotopes have same atomic mass but differ in their mass numbers

Atomic number is defined as the number of protons or electrons that are present in a neutral atom.

Atomic number = number of protons = number of electrons

Mass number is defined as the sum of number of protons and neutrons that are present in an atom.

Mass number = Number of protons + Number of neutrons

Thus, isotopes of an element has same number of protons but they differ in the number of neutrons.

For Example: Chlorine has 2 isotopes, $_(17)^(35)\textrm{Cl}\text{ and }_(17)^(37)\textrm{Cl}$

In $_(17)^(35)\textrm{Cl}$ isotope:

Number of protons = 17

Number of neutrons = 35 - 17 = 18

In $_(17)^(37)\textrm{Cl}$ isotope:

Number of protons = 17

Number of neutrons = 37 - 17 = 20

Hence, the correct answer is Option B.

B because isotopes have the same number of protons but a different number of neutrons

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