Answer:

Explanation:
Hello,
In this case, considering that the compound is 48% oxygen, we infer it is 52% chromium, therefore, by using their atomic masses we compute the moles by assuming those percentages as masses:

Next, by dividing by the smallest moles, we find the subscripts in the empirical formula:

Which are also expressed in the smallest whole numbers, therefore the empirical formula is:

Which corresponds to the chromic oxide or chromium (IV) oxide.
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Antifreeze is an additive in water-based liquid to lower down the freezing point of such liquid. It is used to make use of the colligative properties of solutions specifically freezing-point depression for cold climate and boiling-point elevation to allow higher coolant temperature.
Answer:
A. At the top of the rock stack.
Explanation: