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weeeeeb [17]
3 years ago
14

How are mold and cast related

Chemistry
1 answer:
IrinaVladis [17]3 years ago
3 0
A cast<span> of the organism can then be made using the two types of </span>mold<span>. Natural </span>casts <span>can be formed when minerals are deposited within the </span>mold<span>. </span>Casts<span> can also be synthetically created when the </span>molds<span> are filled or covered with synthetic material such as latex or plaster of paris to generate a replica of the organism.</span>
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What is the empirical formula of a compound containing 90 grams carbon, 11 grams hydrogen, and 35 grams nitrogen? A. C3H4N B. C2
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Answer:

A. C₃H₄N

Explanation:

  • Firstly, we need to calculate the no. of moles of C, H, and N using the relation:

<em>no. of moles = mass/molar mass.</em>

<em></em>

∴ no. of moles of C = mass/molar mass = (90.0 g)/(12.0 g/mol) = 7.5 mol.

∴ no. of moles of H = mass/molar mass = (11.0 g)/(1.0 g/mol) = 11.0 mol.

∴ no. of moles of N = mass/molar mass = (35.0 g)/(14.0 g/mol) = 2.5 mol.

  • We should get the mole ratio of each atom by dividing by the lowest no. of moles (2.5 mol of N).

∴ the mole ratio of C: H: N = (7.5 mol/2.5 mol): (11.0 mol/2.5 mol): (2.5 mol/2.5 mol) = (3: 4.4: 1) ≅ (3: 4: 1).

  • So, the empirical formula is: A. C₃H₄N.
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