How many moles does 8.19 L of gas at STP represent?

Explanation:

           According to Avogadro's Law, same volume of any gas at standard temperature and pressure will occupy same volume. And one mole of any Ideal gas occupies 22.4 dm³ (1 dm³ = 1 L).

Data Given:

                 n = moles = ?

                 V = Volume = 16.8 L

Solution:

               As 22.4 L volume is occupied by one mole of gas then the 16.8 L of this gas will contain

                          = ( 1 mole × 16.8 L) ÷ 22.4 L

                          = 0.75 moles

Result:

          16.8 L of Nitrogen gas will contain 0.75 moles at standard temperature and pressure.

the answer to your question is c.

if you read the house of usher you should know that the house was haunted

possibly, yes.

explanation:

the amount of sugar you take in is dangerously high, risk of heart disease, high risk of diabetes, and etc.