Correct answer- B the electrons every two elements are arranged in energy levels: a maximum two electrons in the first level. ((( i thinkkk )))
Answer:
C
Explanation:
According to John Dalton's Atomic theory, it was about the structure of the atoms: "Each chemical element is composed of extremely small particles that are indivisible and cannot be seen by the naked eye, called atoms"
This may help you.
1. Calculate molecular mass of CuSO4•5H2O
2. Calculate molecular mass of ALL oxygen atoms in CuSO4•5H2O (which are 4 oxygen atoms in CuSO4 and 5 oxygen atoms in H2O so in total its 9 oxygen atoms, thus find molecular mass if 9 oxygen atoms)
3. Do mathematical cross multiplication
Molecular mass of CuSO4•5H2O - <span>1.67×<span>10<span>−2</span></span>moles</span>
molecular mass of 9 oxygen atoms - X moles
so
X= <span>1.67×<span>10<span>−2</span></span>moles</span><span> * molecular mass of 9 oxygen atoms / Molecular mass of CuSO4•5H2
and get the answer :3</span>