Question

question 8
one mole of k₂cro₄ contains ______ moles of o.
4
6.02×10²³
1.51×10²³
2.47×10²³
7.65×10²³

Explanation:

Step1: Analyze the formula of \(K_2CrO_4\)

The formula \(K_2CrO_4\) shows that for each molecule of \(K_2CrO_4\), there are 4 oxygen (\(O\)) atoms.

Step2: Use the mole - atom relationship

By the definition of chemical formula, 1 mole of \(K_2CrO_4\) contains 4 moles of \(O\) atoms. The options \(6.02\times 10^{23}\), \(1.51\times 10^{23}\), \(2.47\times 10^{23}\), \(7.65\times 10^{23}\) are related to the number of atoms (using \(N = n\times N_A\), where \(N_A=6.02\times 10^{23}\ mol^{-1}\)), but the question asks for moles of \(O\), not the number of \(O\) atoms.

Answer:

4