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antiseptic1488 [7]
3 years ago
11

Why was it significant that amino acids were produced from a mixture of methane gas, hydrogen gas, ammonia, and water vapor?

Chemistry
1 answer:
melisa1 [442]3 years ago
8 0

Answer:

It was significant because thanks to Miller's experiment, it was possible to test many years later and with modern techniques, the progress of the evolution of life on Earth.

Explanation:

In Miller's experiment, he subjected a mixture of methane, ammonia, hydrogen, carbon dioxide, nitrogen and water to strong electric shocks and high temperatures. He noted that organic molecules such as glucose, amino acids such as glycine, alanine, glutamic acid and aspartic acid were formed. Subsequently, in 2008 other scientists analyzed these compounds using more sensitive devices. Their analyzes found the formation of 20 amino acids (proteins) and 6 components found in the nucleus of the cells, thus checking the progress of the evolution of life on Earth.

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What is the approximate percent yield for this reaction?<br> Ba(NO3)2 + Na2SO4 —&gt; BaSO4 + 2 NaNO3
melomori [17]

The percent yield for this reaction is 91%.

<u>Explanation</u>:

                   Ba(NO3)2 + Na2SO4 — > BaSO4 + 2NaNO3  

  • Assume that 0.45 mol of Ba(NO3)2 reacts with excess Na2SO4 to create 0.41 mol of BaSO4.  
  • Convert to grams of BaSO4 utilizing its molar mass (233.38 g/mol), which will be giving the actual yield.  
  • Actual Yield = 0.41 mol BaSO4 x (233.38 g BaSO4/1 mol BaSO4)  

                               = 96 g BaSO4  

  • Beginning with 0.45 mol of Ba(NO3)2, compute the theoretical yield of BaSO4. Mole proportion of Ba(NO3)2 to BaSO4 is 1:1.  
  • 0.45 mol Ba(NO3)2 x (1 mol BaSO4/1 mol Ba(NO3)2) x (233.38 g BaSO4/1 mol BaSO4) = 105 g BaSO4  

                    % Yield = (Actual Yield/Theoretical Yield) x 100%  

                              = (96/105) x 100%  

                               = 91%.

6 0
3 years ago
Read 2 more answers
Which of the following is NOT true of white dwarfs?
liq [111]

Answer:

A white dwarf is what stars like the Sun become after they have exhausted their nuclear fuel. Near the end of its nuclear burning stage, this type of star expels most of its outer material, creating a planetary nebula. Only the hot core of the star remains. ... That means a white dwarf is 200,000 times as dense.

Explanation:

they are cold

they are about the size of Earth

these both are not true

6 0
3 years ago
Read 2 more answers
What two particles account for almost all of the mass of an atom?
algol [13]
The two particles that account for the mass of an atom are protons and neutrons. Electrons on the other hand are negligible mass, and so light they are considered without weight.
6 0
3 years ago
Read 2 more answers
The Kelvin temperature required for 0.0470 mol of helium gas to fill a balloon to 1.20 L under 0.878 atm is
4vir4ik [10]
From the ideal gas law, PV = nRT, we can rearrange the equation to solve for T given the other parameters.

T = PV/nR

where P = 0.878 atm, V = 1.20 L, n = 0.0470 moles, and R = 0.082057 L•atm/mol•K. Plugging in our values, we obtain the temperature in Kelvin:

T = (0.878 atm)(1.20 L)/(0.0470 mol)(0.082057 L•atm/mol•K)
T = 273 K

So, the second answer choice would be correct.
7 0
3 years ago
How many atoms of zinc are required to weigh 5.4 ng
Gwar [14]

Answer:

4.97 X 10^13 ATOMS OF Zn

Explanation:

how many atoms of zinc are required to weigh 5.4 ng

a nano gram is 10^-9 grams

Zinc has an atomic mass of 65.39 gm/moles

there is an Avogadros number of atoms in a mole

65.39 GRAMS PER MOLE

65.39 g/(6.022 X 10^23)how many atoms of zinc are required to weigh 5.4 ng

 GRAMS PER ATOM

1.086 GRAMS PER  1O^22 ATOMS

1 atom of Zn weighs 1.086 X 10^9 X 1O^-22 n grm=

1,086 X 10^-13 n gm                              

Y tines 1.086 X 10^-13 = 5.4 n gm

Y = 5.4/ (1.086 X 10^-13) =

4.97 X 10^13 ATOMS OF Zn

CHECK

(4.97 X 10^13 ) X 65.39 gm/(6.022 X 10^23) =

5.397 X 10^-9 =

5.4 n g

6 0
2 years ago
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