Question

3.) it is possible to convert moles to particles by (1 point)
dividing by 6.02 x 10^23.
multiplying by the molar mass.
multiplying by 6.02 x 10^23.
dividing by the molar mass.
4.) one mole of hno3 contains 3 atoms of oxygen (1 point)
true
false
5.) 1 mole of al2(so4)3 contains 7 atoms of oxygen. (1 point)
true
false

Explanation:

Step1: Recall mole - particle conversion

One mole of any substance contains Avogadro's number ($6.02\times 10^{23}$) of particles. To convert moles to particles, we multiply the number of moles by $6.02\times 10^{23}$.

Step2: Analyze $HNO_3$ formula

The formula $HNO_3$ indicates that in one molecule of $HNO_3$, there are 3 oxygen atoms. So, in one mole of $HNO_3$ (which contains $6.02\times 10^{23}$ molecules of $HNO_3$), there are $3\times6.02\times 10^{23}$ oxygen atoms, not just 3 oxygen atoms.

Step3: Analyze $Al_2(SO_4)_3$ formula

In the formula $Al_2(SO_4)_3$, the sub - script of oxygen is 4 and there are 3 sulfate ($SO_4$) groups. So the number of oxygen atoms in one formula unit of $Al_2(SO_4)_3$ is $4\times3 = 12$. In one mole of $Al_2(SO_4)_3$ (which contains $6.02\times 10^{23}$ formula units of $Al_2(SO_4)_3$), there are $12\times6.02\times 10^{23}$ oxygen atoms, not 7 oxygen atoms.

Answer:

1. multiplying by $6.02\times 10^{23}$
2. False
3. False