Many laboratory gases are sold in steel cylinders with a volume of 43.8 L. What mass (in grams) of argon is inside a cylinder whose pressure is 17615kPa at 23∘C?

Answers

Answer 1

Answer: It's very simple... if we remember value of Universal Gas Constant R and Ideal Gas Law, so...

Ideal Gas Law
pV = nRT, where:
p - pressure (in kPa),
V - volume (in L),
n - number of moles (in mol),
R - universal cas constant (in kPa * L / mo l* K),
T - temperature (in K)

n = m/M, where:
n - number of moles,
m - mass (in grams),
M - molar mass of ingredient (in g/mol) - you find this at Periodic Table.

pV = nRT ---> pV = mRT/M ---> pVM = mRT ---> pVM/RT = m

p = 17615 kPa
T = 273.15 + 23 = 296.15 K
V = 43.8 L
R = 8.314 kPa * L / mol * K
M (for argon) = 39.948 g/mol

and

m = (17615 kPa * 48.3 L * 39.948 g/mol) / (296.15 K * 8.314 kPa * L / mol * K)
m = 13803.93 grams of Argon

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Answers

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Which statement correctly compares an atom of an alkali metal with an atom of the alkaline earth metal next to it on the periodic table?The alkali metal atom forms a +1 ion, while the alkaline earth metal atom forms a +2 ion.
The alkali metal atom forms a +2 ion, while the alkaline earth metal atom forms a +1 ion.
The alkali metal atom has one less shell of electrons than the atom of the alkaline earth metal.
The alkali metal atom has one more shell of electrons than the atom of the alkaline earth metal.

Answers

Answer: The alkali metal atom forms a +1 ion, while the alkaline earth metal atom forms a +2 ion.

Explanation: Group 1 elements are called as alkali metals and group 2 elements are called as alkaline earth metals.

For example, Li is an alkali metal and Be is an alkaline earth metal.

Lithium(Li) has an atomic number of 3 and the electronic configuration is:

Li: $1s^22s^1$

Thus lithium has to lose 1 electron and acquire 1+ charge to attain nearest noble gas configuration.

$Li^+:1s^2$

Berrylium(Be) has an atomic number of 4 and the electronic configuration is:

Be: $1s^22s^2$

Thus berrylium has to lose 2 electrons and acquire 2+ charge to attain nearest noble gas configuration.

$Be^(2+):1s^2$

Answer:

Explanation:

Similarities and differences between the male and female reproductive systems

Answers

Another significant difference is that the female reproductive system produces only one egg per month during a woman's reproducive years. This translates to only several hundred eggs produced during her lifetime. The male reproductive has literally millions of sperm cells available daily, as opposed to a single egg per month.

Final answer:

The male and female reproductive systems have similarities and differences. Both systems have specialized organs involved in reproduction, but they produce different gametes and have different external genitalia. The female system can support the development of a fertilized egg.

Explanation:

SIMILARITIES

The male and female reproductive systems have a common goal of producing offspring. Both systems include specialized organs and structures involved in the process. For example, both have gonads (testes in males and ovaries in females) that produce gametes (sperm in males and eggs in females).

DIFFERENCES

One major difference is the production of different gametes: sperm in males and eggs in females. Another difference is the presence of different external genitalia: male genitalia and scrotum in males and vulva in females. The female reproductive system also has the ability to support the development of a fertilized egg, while the male system does not have this capability.

Learn more about Similarities and differences between male and female reproductive systems here:

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Rank the four gases (air, exhaled air, gas produced from from decomposition of H2O2, gas from decomposition of NaHCO3) in order of increasing concentration of oxygen).

Answers

The concentration in this case will be expressed as mole oxygen per mole compound or mixture. In air, there are 42 moles of oxygen per 100 moles air. In exhaled air, there are 32 moles Oxygen per 100 moles ex. air. The decomposition of h2o2 results to 2 moles h2O and 1 mole oxygen. Hence there are 4 mole oxygen per 7 moles product.The decomposition of NaHCO3 results ot Na2CO3, Co2 and H20. there are 6 moles pxygen per 12 moles atoms. The ranking (increasing to decreasing) is decomposition of H2O2, decomposition of NaHCO3, air, and exhaled air.

Hydrogen bonding is a type of(1) strong covalent bond
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(4) weak intermolecular force

Answers

Option 3. strong intermolecular force

Certain substances such as H2O, HF, NH3 from hydrogen bonds, and the formation of which affects properties (mp,bp,solubility) of substance. Other compounds containing OH and NH2 groups also form hydrogen bond. Molecules of many organic compounds such as alcohols, acids, amines, and amino acids contain these groups, and thus hydrogen bonding plays an important role in biological science.

Given the reaction below, which is the oxidized substance?
Mg + Cl2 Mg2+ + 2Clmc005-2

Answers

Answer:

Mg+Cl2 = Mg2+2Cl

Explanation:

Firstly balance the equation

2Mg+Cl2=Mg2+2Cl

the oxidized substance=Cl2

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