The molecular formula of butene is C₄H₈. Which of the following is the empirical formula of butene? A) CH B) C₂H₂ C) C₄H₈ D) (CH₂)₄ (b) Calculate the relative formula mass of butene, C₄H₈. (relative atomic masses: H = 1, C = 12) (c) When burnt completely in air, butene forms carbon dioxide and water.

Photo AI

The molecular formula of butene is C₄H₈ - Edexcel - GCSE Chemistry - Question 4 - 2018 - Paper 1

Question 4

The molecular formula of butene is C₄H₈. Which of the following is the empirical formula of butene? A) CH B) C₂H₂ C) C₄H₈ D) (CH₂)₄ (b) Calculate the relative for... show full transcript

Worked Solution & Example Answer:The molecular formula of butene is C₄H₈ - Edexcel - GCSE Chemistry - Question 4 - 2018 - Paper 1

Step 1

Which of the following is the empirical formula of butene?

96%

114 rated

Answer

The molecular formula of butene is C₄H₈. To find the empirical formula, we divide the subscripts by their greatest common divisor. The greatest common divisor of 4 and 8 is 4.

Thus:

C: 4 ÷ 4 = 1
H: 8 ÷ 4 = 2

Therefore, the empirical formula of butene is CH₂, which corresponds to option B.

Step 2

Calculate the relative formula mass of butene, C₄H₈.

99%

104 rated

Answer

To calculate the relative formula mass of butene (C₄H₈), we sum the relative atomic masses of carbon and hydrogen:

Carbon (C): 4 atoms × 12 = 48
Hydrogen (H): 8 atoms × 1 = 8

Thus, the total relative formula mass is:

$ext{Relative Formula Mass} = 48 + 8 = 56$

Step 3

When burnt completely in air, butene forms carbon dioxide and water.

96%

101 rated

Answer

The combustion of butene in air can be represented by the balanced chemical equation:

ightarrow 4 ext{CO}_2 + 4 ext{H}_2 ext{O}$$ The products of this reaction are carbon dioxide (CO₂) and water (H₂O), confirming that when butene is burnt, it yields these substances.

Join the GCSE students using SimpleStudy...

97% of Students

Report Improved Results

98% of Students

Recommend to friends

100,000+

Students Supported

1 Million+

Questions answered

;