In excitation electrons move from an energy level to a higher energy level
and ionization is to remove an electron from an atom.
207.2
lead-208 is actually the heaviest stable isotope, fun fact
The method is called the displacement method.
You place some water in the graduated cylinder and measure its volume.
Then you add your object and measure the new volume.
The difference between the two volumes is the volume of your object.
The mass, in grams, of NaCl needed to use to make the solution is 1.76grams.
<h3>HOW TO CALCULATE MASS?</h3>
The mass of a substance can be calculated by multiplying the number of moles by its molar mass.
However, the number of moles must first be calculated by using the following expression:
Molarity = no. of moles ÷ volume
no. of moles = 0.249 × 0.1208
no. of moles = 0.03moles
Molar mass of NaCl = 23 + 35.5 = 58.5g/mol
mass of NaCl = 0.03 × 58.5 = 1.76g
Therefore, the mass, in grams, of NaCl needed to use to make the solution is 1.76grams.
Learn more about mass at: brainly.com/question/19694949
Answer:
Sodium Bicarbonate on decomposition produces Carbon dioxide gas and Water vapors.
<span> 2 NaHCO</span>₂<span> </span> →<span> Na</span>₂<span>CO</span>₃<span> (s) </span>+ <span> CO</span>₂<span> (g) + H</span>₂<span>O (g)
</span>
Explanation:
Let suppose you burn 168 g ( 2 moles ) of NaHCO₃, a gas will produced and product is left behind. On measuring the product formed it will be almost equal to 105 g. This shows that the product is Na₂CO₃ and 1 mole of it is being produced after decomposition of sodium bicarbonate.