3 years ago

A compound is 40% carbon, 6.7% hydrogen, and 53.3% oxygen. What is the empirical formula? (4 points)

Chemistry

1 answer:

Elis [28]3 years ago

4 0

Answer:

CH2O

Explanation:

Dividing by the atomic masses:

40 / 12 = 3.333

6.7 / 1 = 6.7

53.3 / 16 = 3.331

The ratios are

3.333/ 3.333 : 6.7 / 3.333 : 3.331/3.333

= 1:2:1.

So it is CH2O.

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When 91.5 g of isopropyl alcohol which has an empirical formula of C3H8O is burned in excess oxygen gas, how many grams of H2O a

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First let us generate a balanced equation for the reaction. This is illustrated below:

2C3H8O + 9O2 —> 6CO2 + 8H2O

Next we will calculate the molar mass and masses of C3H8O and H20. This is illustrated below:

Molar Mass of C3H8O = (3x12.011) + (8x1.00794) + 15.9994 = 36.033 + 8.06352 + 15.9994 = 60.09592g/mol.

Mass of C3H8O from the balanced equation = 2 x 60.09592 = 120.19184g

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