A1.0-gram sample of which element will uniformly fill a closed 2.0-liter container at stp?

a. sulfur
b. carbon
c. xenon
d. mercury

Carbon

Explanation:

To know this, let's write the ideal gas expression:

PV = nRT

As we are in STP, means that we have a pressure of 1 atm and 0 °C or 273.15 K. So, we have the volume which is 2 L, all we have to do is to calculate the moles of the substance, and then, the molecular weight with the given mass. The molecular weight that matches any of the option, would be the elemento that fullfill these conditions:

the moles (n):

n = PV/RT

n = 1 * 2 / (0.08206*273.15)

n = 0.089 moles

Now that we have the moles, let's calculate the molecular weight.

MM = m/n

MM = 1 / 0.089

MM = 11.24 g/mol

This molecular weight is very close to the molecular mass of the carbon (12 g/mol) . So the correct option is b, carbon.

answer is: c. the experiment shows that the red substance experienced a chemical change.

this is chemical change (chemical reaction), because two new substances are formed (metalig liquid and gas), the atoms are rearranged and the reaction is followed by an energy change.

this is example of chemical decomposition.

chemical decomposition (analysis) is the separation of a single chemical compound into its two or more elemental parts or to simpler compounds.  

chemical decomposition is opposite of chemical synthesis.

i'm assuming that it's c.) red bank..