A) mass is always conserved in a reaction
Answer:
- The NaCl solution will have higher boiling point.
Explanation:
- C2H6O2 is a molecular substance. Meaning that when it dissolves it will remain this way:
C2H6O2 ---------> C6H12O6 (aq)
- Sodiumchloride (NaCl) is an ionic substance. Meaning that when it dissolves, it will create ions:
NaCl(s)-------> Na+(aq) + Cl- (aq)
Conclusion:
- NaCl is an ionic compound and C2H6O2 is a molecular compound. Ionic compounds have higher boiling points than molecular compounds. Therefore, NaCl will have the higher boiling point.
Explanation:
Mass of an electron =9.1×10−28g
∴ mass of one mole
=9.1×10−28×6.02×1023
=54.78×10−4g
Answer:
4K + O2 ---> 2K2O
Explanation:
The valence of Potassium is +1
The valence of oxygen is -2
Thus, two atoms of potassium will attach with one atom of oxygen to form molecule of potassium oxide.
This can be written as
2K + O ---> K2O
However, this is not the balanced equation as oxygen exists as O2 molecule.
Thus, the balanced equation is
4K + O2 ---> 2K2O