You are to convert 3.55 moles of
NaCl to formula units. Always remember that the
Avogadro’s number is 6.023*10^23 units per mole of a substance. Units could be
atoms, molecules or formula units. So, just multiply 3.55 moles
to <span>6.023*10^23 formula units per mole and you will get
2.138x10^24 formula units of NaCl.</span>
The three particles found in an atom are the protons, neutrons and electrons. Protons have a positive charge. Electrons have negative charge. Lastly, neutrons have no net electrical charge. Protons and neutrons are much heavier than electrons and are located in the center of the atom.
Answer:
B) Polonium and Arsenic
Explanation:
Metalloids are a small category of elements that are right between metals and non-metals, and have properties from those categories.
The most recognized are: Boron, Silicon, Germanium, Arsenic, Antimony, and Tellurium.
Some that are irregularly recognized are Polonium and Astatine.
The only option with the elements in either of the shown elements is B) Polonium and Arsenic.
Answer:
The correct answer is 0.165 g NaCl.
Explanation:
The following is the precipitation reaction taking place between sodium chloride and silver nitrate:
NaCl (aq) + AgNO₂ (aq) ⇒ NaNO₃ (aq) + AgCl (s)
The complete ionic reaction of the reaction will be,
Na⁺ + Cl⁻ + Ag⁺ + NO₃⁻ ⇒ AgCl (s) + Na⁺ + NO₃⁻
Hence, the net ionic equation for the mentioned reaction is:
Ag⁺ (aq) + Cl⁻ (aq) ⇒ AgCl (s)
Thus, it can be witnessed that one mole of chloride ion is needed so that one mole of Ag⁺ ion get neutralized. There is a need to find the moles of silver ions present in the solution of AgNO₃ and then transform these moles to the moles of chloride ion. Ultimately, these moles can be converted to the concentration of sodium chloride needed.
The no. of moles of silver ions found in silver nitrate solution is,
(2.50 × 10² mL) × (0.0113 mol Ag⁺/1000 ml solution) = 2.83 × 10⁻³mol Ag⁺
Now the moles of chloride ions needed to precipitate the silver ions is,
(2.83 × 10⁻³ mol Ag⁺ ) × (1 mol Cl⁻/1 mol Ag⁺) = 2.825 × 10⁻³mol Cl⁻
The mass of sodium chloride needed for precipitating the silver ions will be,
mass of NaCl = (2.83 × 10⁻³ mol Cl⁻) × (1 mol NaCl / 1 mol Cl⁻) × (58.44 grams / 1 mol NaCl)
= 0.165 gram NaCl.
Explanation:
During a physical change only the physical properties of a matter such as it state and form.
Physical properties of matter tells us everything about what a substance is and when no change is occurring to its constituents.
- In a physical change no new kind of matter is formed.
- it usually involves no change in mass
- requires little to no energy
- they are easily reversible
- examples are melting, boiling, freezing e.t.c
learn more:
physical change brainly.com/question/10972073
#learnwithBrainly
