What type of machine is a ramp for wheelchairs?

a. mechanical machine
b. compound machine
c. simple machine
d. complex machine

The empirical formula is CHO

The molecular formula is C4H4O4

Explanation:

Step 1: Data given

Mass of fumaric acid = 33.4 grams

Moles fumaric acid = 0.288 moles

Fumaric acid contains:

41.39 % C

3.47 % H

The rest of the compound is O

Step 2: Calculate the % O

100 - 41.39 - 3.47 = 55.14 %

Step 3: calculate mass

Mass C = 0.4139 * 33.4 grams = 13.82 grams

Mass H = 0.0347 * 33.4 grams = 1.16 grams

Mass O = 0.5514 * 33.4 grams = 18.42 grams

Step 4: Calculate moles

Moles = mass / molar mass

Moles C = 13.82 grams / 12.01 g/mol = 1.15 moles

Moles H = 1.16 grams / 1.01 g/mol = 1.15 moles

Moles O = 18.42 grams / 16.0 g/mol = 1.15

The empirical formula is CHO

The molecular weight is 29.02 g/mol

Step 5: Calculate molar mass of fumaric acid

Molar mass = mass / moles

Molar mass = 33.4 grams / 0.288 moles

Molar mass = 115.97 g/mol

Step 6: Calculate molecular formula

115.97 / 29.02 = 4

We have to multiply the empirical formula by 4

4*(CHO) = C4H4O4

The molecular formula is C4H4O4