Answer:
Element Symbol Atomic Mass # of Atoms Mass Percent
Chlorine Cl 35.453 2 29.670%
Calcium Ca 40.078 1 16.770%
Oxygen O 15.9994 8 53.559%
Explanation:
Answer:
One mole of a substance is equal to 6.022 × 10²³ units of that substance (atoms, molecules, or ions)
Explanation:
This number is Avogadro's number. The concept of the mole can be used to convert between mass and number of particles. its used to compare very large numbers.
Speed is a scalar quantity( quantity having only magnitude). So it doesn't specifies direction. Hence option C.) 5Km/hr north is incorrect.
