Answer:
their made of co2 ice as well as water ice
a. The symbol , , ,
b. Isotope of Na
<h3>Further explanation</h3>
Atomic number=number of protons=number of electrons(neutral atom)
Number of neutrons=mass number-atomic number
Mass number=protons+neutrons
B. atomic number=11, mass number=11+12=23⇒Sodium
C. atomic number=18, mass number=18+22=40⇒Argon
D. atomic number=15, mass number=15+16=31, charge -3(electron-proton)⇒Phosphor
E. atomic number=13, mass number=13+14=27, charge +3(proton-electron)⇒Aluminium
Isotope=the same atomic mass, different neutron(mass number)
So the atom⇒isotope of Sodium(Na)
The formula of determining the molarity is:
molarity = -(1)
Volume of solution = (given)
Since, 1 mL = 0.001 L
Therefore, volume of the solution = 0.22 L
Molarity = 0.194 M (given)
Substituting the values in formula (1)
Now, number of moles = -(2)
Molar mass of =
Substituting the value of number of moles and molar mass of in equation -(2)
Hence, the mass in grams of potassium permanganate the chemist has added to the flask is .
I think the answer is true