Question

Glucose + 2X -enzymes-> 2 Pyruvic acid + 4ATP. What substances is indicated by "X" in this equation?

Answer 1

See explanation.

Explanation:

`"Glucose" + 2"X" - "enzymes" -> 2 "Pyruvic acid" + 4"ATP"`

Let us represent the chemical reaction

`C_6H_12O_6 + 2X -> 2C_3H_4O_3 + 4C_10H_16N_5O_13P_3`

Now multiply the number of moles to the number of moles of each element

for example = `2H_2 = H2 * 2 = H4`

This is not true but helps in determining the missing reactant or missing product as in this problem.

The result would be

`C_6H_12O_6 + 2X -> C_6H_8O_6 + C_40H_56N_20O_52P_12`

Now show the number of atoms of each element in each compound we know.

`C_6H_12O_6 = H_12, O_6, C_6`
`C_6H_8O_6 = H_8, O_6, C_6`
`C_40H_56N_20O_52P_12 =H_56, O_52, C_40, P_12`

Add the no. of elements in the products and subtract it from the elements in reactants. it will give

`H_56 + H_8 -H_12 = "52 atoms of hydrogen"`

`O_52 + O_6-O_6 = "52 atoms of oxygen"`

`C_40 + C_6 - C_6 = "40 atoms of carbon"`

`P_12 - 0 = P_12`

so the remaining atoms would be `2"X"` as energy is neither created nor destroyed, so

`"X" = (C_40H_52O_52P_12)/2 = C_20H_26O_26P_6"`