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Dimas [21]
3 years ago
11

The numbers represent the change in energy for a chemical reaction. They are calculated by subtracting the energy of products fr

om the energy of reactants. Which number would result from an endothermic reaction?
Chemistry
1 answer:
Vsevolod [243]3 years ago
7 0

Answer:jb hn jbil

brefyxfycb cghvhgbnbhijgiuh

Explanation:nbygughuhijijo9jio

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The human body excretes nitrogen in the form of urea, NH₂CONH₂. The key step in its biochemical formation is the reaction of wat
Misha Larkins [42]

Mass perventage of nitrogen in urea, arginine, ornithine is   46.67%, 32.2%,21% respectively.

What is Mass perventage ?

Mass percentage is one way of representing the concentration of an element in a compound or a component in a mixture. Mass percentage is calculated as the mass of a component divided by the total mass of the mixture, multiplied by 100.

Molecular mass of urea (NH2CONH2) is= 2× (Atomic mass of N ) + 4 × (Atomic mass of H) + (Atomic mass of C) (Atomic mass of O) = 60

Mass percentage of N = Total mass of N atoms in the compoundMass of compound×100=2860×100=46.67%

chemical formula for arginine is C6H14N4O2

molar mass of C6H14N4O2=174g/mol

moles of N atoms in C6H14N4O2=4

mass of N atoms=14*4=56g

mass percent of N in C6H14N4O2=(56/174)*100=32.2%

the chemical formula for ornithine is C5H12N2O2

molar mass of C5H12N2O2=132g/mol

moles of N atoms in C5H12N2O2=2

mass of N atoms in C5H12N2O2=2*14=28

mass percent of N in C5H12N2O2=(28/132)*100=21%

To learn more about urea click on the link below:

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7 0
1 year ago
Which statement best describes how atoms combine to form sodium chloride (NaCl)?
Murljashka [212]

The answer is D. A positively charged sodium Ion and a negatively charged chlorine ion form an ionic bond.

5 0
3 years ago
Read 2 more answers
Calculate the molarity of 22.5 g of MgS in 829 mL of solution
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Answer:18652.5

Explanation

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Suppose you have a dozen carbon atoms, a dozen gold atoms, and a dozen iron atoms. Even though you have the same number of each,
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Answer:

By weight they have the same mass, but the number of atoms is different

Explanation:

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3 years ago
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Answer:

C

Explanation:

4× CH2 = C4H8

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2 years ago
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