We’re being asked to identify plausible sets of formulas for two compounds.

We’re given a 1.00-g sample of each compound. One sample contains 0.25 g of X and the other contains 0.33 g of X.

**Compound 1:**

mass X = **0.25 g**

mass Y = 1.00 g – 0.25 g =** 0.75 g**

**Compound 2:**

mass X = **0.33 g**

mass Y = 1.00 g – 0.33 g =** 0.66 g**

Let's take look at each option given:

**XY _{3} and XY_{4}**

Let's use a **hypothetical molar mass** for X and Y to get XY_{3}.

Suppose there are two known compounds containing the generic elements X and Y. You have a 1.00-g sample of each compound. One sample contains 0.25 g of X and the other contains 0.33 g of X.

Identify plausible sets of formulas for these two compounds. Check all that apply.

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