One mole of any substance contains 6.02 x 10²³ particles.
One mole of oxygen has 6.02 x 10²³ atoms
One mole of caffeine has 6.02 x 10²³ molecules
One mole of diatomic nitrogen contains two moles of nitrogen atoms. Atomic mass of nitrogen is 14 g. Thus,
Mass of diatomic nitrogen = 2 x 14 = 28 g
Answer:
Adenine forms two hydrogen bonds with thymine;
guanine forms three hydrogen bonds with cytosine
Explanation:
There are three hydrogen bonds between guanine and cytosine. Between adenine and thymine, two hydrogen bonds form. Complementary pairs always include one base of purine and one base of pyrimidine.
The question requires to balance the equation.
The equation is already balanced, so the answer is:
<span>Ca(s)+Br2(l)⟶CaBr2(s)
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</span><span>Explanation:
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</span><span>1) The phases are identified with a letter to the right of the compound or element:
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</span><span>So, for Ca, the phase is (s) which means solid.
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</span><span>For Br₂ (l) the phase is (l) which means liquid.
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</span><span>For CaBr₂(s) the phase is (s) which means solid.
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</span><span>2) The core work of balancing is make the number of atoms of each element on the reactants equal to the same number of atoms on the products side.
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</span><span>That is the law of conservation of mass applied to chemcial reactions.
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</span><span>3) So, you have to add coefficientes on the right place to make the number of atoms on the left side equal to the number of the same kind of atom on the right side.
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</span><span>In this table you can verify that the equation given is balanced:
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</span><span>atom left side right side
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</span><span>Ca 1 1
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</span><span>Br 2 2
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</span><span>So, you do not need to modify any coefficients.
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I think its A. but i'm not 100% sure.
Answer:
There are four major classes of biological macromolecules (carbohydrates, lipids, proteins, and nucleic acids)
Explanation:
There are four major classes of biological macromolecules (carbohydrates, lipids, proteins, and nucleic acids), and each is an important component of the cell and performs a wide array of functions. ... Biological macromolecules are organic, meaning that they contain carbon.
