What is the formula of the substance, the constituent fractions of the elements of which are W (C) -75%; W (H) -25%.
February 6, 2021 | education
| Mass ratio of elements in an unknown compound:
w (C): w (H) = 75: 25
Taking into account the atomic masses of the elements, let’s move on to the quantitative ratio:
n (C): n (H) = w (C) / M (C): w (H) / M (H) = 75/12: 25/1 = 6.25: 25 = 1: 4
This means that in an unknown compound there are 4 hydrogen atoms per 1 carbon atom, whence the simplest formula of this compound is CH4 (methane).
Answer: CH4.
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