SCIENCE
PHYSICAL SCIENCES
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
5
|
|
|
3
|
|
|
6
|
|
|
2
|
Detailed explanation-1: -Answer and Explanation: The compound Fe2 O3 contains five atoms in each molecule of the compound.
Detailed explanation-2: -Fe2O3 is the chemical formula of Iron(III) oxide which has three oxygen atoms, and two iron atoms.
Detailed explanation-3: -A molecule is a group of two or more atoms held together by attractive forces known as chemical bonds; depending on context, the term may or may not include ions which satisfy this criterion.
Detailed explanation-4: -Iron has a molar mass of 55.84 grams/mole. So, five grams divided by 55.84 grams/mole gives us 0.089 moles of iron. Here we see the practicality of using moles. If we were to represent five grams of iron in term of the number of atoms of iron, we would get 5.3x1022 atoms of iron.
Detailed explanation-5: -ratio of oxygen in Fe2O3 :oxygen inFeO=3:1.