Astudent collects 625 ml of oxygen at a temperature of 24°c and a pressure of 0.899 atm. how many moles of oxygen did the student collect?

0.023 moles

Explanation:

Given that:

Pressure = 0.899 atm

Temperature = 24 °C

The conversion of T( °C) to T(K) is shown below:

T(K) = T( °C) + 273.15  

So,  

T = (24 + 273.15) K = 297.15 K

Volume = 625 mL

Also, 1 mL = 10⁻³ L

So, volume = 0.625 L

Moles of the gas = ?

Using ideal gas equation as:

PV=nRT

where,  

P is the pressure

V is the volume

n is the number of moles

T is the temperature  

R is Gas constant having value = 0.0821 L.atm/K.mol

Applying the equation as:

0.899 atm × 0.625 L=n × 0.0821 L.atm/K.mol ×  297.15 K

⇒n = 0.023 moles

aquifers are bounded above and below by impermeable rock. the driving force of groundwater movement in confined aquifers is pressure, rather than gravity.

a. energy is absorbed in the reaction.

if in a given reaction the energy of products is greater than the energy of reactants it means that reaction is endothermic and during the reaction, the energy is absorbed by reactants. in an endothermic reaction, the products have more stored chemical energy than the reactants. and in this reaction the reactants are more stable than products before the compounds with less energy are always more stable.