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Evgen [1.6K]
3 years ago
7

Element X

Chemistry
1 answer:
dedylja [7]3 years ago
7 0
Element x is Silicon
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Doubling the amplitude of a wave means that you increase the ___ of a wave factor of _______
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Doubling the amplitude of a wave means that you increase the energy of a wave factor of quadrupling
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How many moles of water produced from 13.5 mol of oxygen
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The combustion of 135 mg of a hydrocarbon produces 440 mg of CO2 and 135 mg H2O. The molar mass of the hydrocarbon is 270 g/mol.
NeX [460]

Answer:

Molecular formula = C20H30

Explanation:

NB 440mg = 0.44g, 135mg= 0.135g

From the question, moles of CO2= 0.44/44= 0.01mol

Since 1 mol of CO2 contains 1mol of C, it implies mol of C = 0.01

Also from the question, moles of H2O = 0.135/18= 0.0075mole

Since 1 mol of H2O contains 2mol of H, it implies mol of H = 0.0075×2= 0.015 mol of H

To get the empirical formula, divide by smallest number of mole

Mol of C = 0.01/0.01=1

Mol of H = 0.015/0.01= 1.5

Multiply both by 2 to obtain a whole number

Mol of C =1×2 = 2

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Empirical formula= C2H3

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Molecular formula= [C2H3]10= C20H30

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