Question

26 Milkweed contains a poison known as cardenolides. Monarch butterflies eat the milkweed plant and hold on to this toxic compound. The
chemical formula for cardenolides is shown below.
CH18C20H15CHCO2
Problem
How many atoms of each element are in one molecule of cardenolides?
A
42 carbon atoms, 23 hydrogen atoms, and 2 oxygen atoms
B
20 carbon atoms, 33 hydrogen atoms, and 2 oxygen atoms
с
34 carbon atoms, 43 hydrogen atoms, and 2 oxygen atoms
D
23 carbon atoms, 34 hydrogen atoms, and 2 oxygen atoms

please help ASAP !!

Answer 1

Cardenolides, with the chemical formula CH₁₈C₂₀H₁₅CHCO₂ have (D) 23 carbon atoms, 34 hydrogen atoms, and 2 oxygen atoms.

Milkweed contains a poison known as cardenolides. The chemical formula for cardenolides CH₁₈C₂₀H₁₅CHCO₂.

The subscripts in the formula represent the atomicities, that is the number of atoms of each element in each part of the formula.

We can calculate the total number of atoms of each element by adding its atomicities.

Carbon atoms

$C = 1 + 20 + 1 + 1 = 23$

Hydrogen atoms

$H = 18 + 15 + 1 = 34$

Oxygen atoms

$O = 2$

Cardenolides, with the chemical formula CH₁₈C₂₀H₁₅CHCO₂ have (D) 23 carbon atoms, 34 hydrogen atoms, and 2 oxygen atoms

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