Ou have been given a 200.00 ml canister containing an unidentified gas. after accounting for the mass of the container, you determine the mass of the actual gas is 0.376 g. the pressure gauge on the cannister reads 874 mmhg, and the temperature gauge reads 298.15 k. what is the identity of the gas? (r= 0.0821 l atm/ mol k)

Ar (argon)

Explanation:

1) Data:

V = 200.00 ml = 0.20000 liter

m = 0.376 g

p = 874 mmHg = 1.15 atm

T = 298.15 K

R = 0.0821 atm×liter / mol×K

2) Formulas:

i) pV = nRT

ii) molar mass = mass in grams / number of moles

3) Solution

i) pV = nRT ⇒ n = pV / RT= 1.15 atm × 0.20000 liter / (0.0821 atm×liter/K×mol × 298K)

n = 0.0094 mol

ii) molar mass = 0.376 g / 0.0094 mol = 39.99 g/mol

Now you have to compare with the molar masses of your set of choices.

The molar mass of argon is 39.95 g/mol, so that is the right choice.

out of these options:

ability to burn paper

pure sodium reacting violently with water

the boiling point of water

helium does not tend to react with anything

i would say this is a physical property:

helium does not tend to react with anything

why? :

i said helium does not tend to react with anything because well, it reacts to ! but ability to burn paper, pure sodium reacting violently with water, & the boiling point of water are chemical or

physical properties: the properties of a substance that can be observed without changing the chemical makeup of the substance

chemical properties: properties of a substance relating to the chemical nature and reactivity of the substance

catya that's not even a b or c