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Karo-lina-s [1.5K]
3 years ago
7

How many standard amino acids are there in the human body?

Chemistry
1 answer:
Whitepunk [10]3 years ago
5 0

Answer:

-Theres 20 amino acids in the human body

-The least number of amino acids in a polypeptide are 10

Explanation:

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a perfect cube of aluminum metal was found to weigh 20.00 g. the density of aluminum is 2.70 g/ml . what is the dimension of the
Rudiy27
So Volume = to mass / density, right?

20 / 2,70 g/ml = 7.407

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An iron bar of mass 841 g cools from 84°C to 7°C. Calculate the heat released (in kilojoules) by the metal.
Oduvanchick [21]

Answer:

28.75211 kj

Explanation:

Given data:

Mass of iron bar = 841 g

Initial temperature = 84°C

Final temperature = 7°C

Heat released = ?

Solution:

Specific heat capacity:

It is the amount of heat required to raise the temperature of one gram of substance by one degree.

specific heat capacity of iron is 0.444 j/g.°C

Formula:

Q = m.c. ΔT

Q = amount of heat absorbed or released

m = mass of given substance

c = specific heat capacity of substance

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ΔT = -77°C

By putting values,

Q = 841 g × 0.444 j/g.°C × -77°C

Q = 28752.11 j

In Kj:

28752.11 j × 1 kJ / 1000 J

28.75211 kj

8 0
3 years ago
How many grams of iron (3)sulfide are produced when 131 grams of iron react with excess sulfur?
Tomtit [17]

<u>We want the molar mass (gfm) of Fe and FeS.</u>

Fe = 55.8 g/mol and FeS = 87.8 g/mol (55.8 +32.0).

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We want  ratio between Fe:FeS 8:8. This comes from the coefficients of the equal chemical equation.

Now we set up conversion factors following the roadmap from above.

Unit we want in the numerator, unit to cancel in the denominator.

Multiply the numerators, and divide the denominators.

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243.82 g \ of Fe_2S_3

The outcome is 243.82 g of ferrous sulphite

By the above given formula we can find any amount of Fes produced by any amount of  ferrous react with sulphite.

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900 mph................

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