Mackydoodle said:Homework Statement
Calculate the volume of .250 g of helium at STP.
This seems so simple but I keep getting the wrong answers.
If someone could walk me through how to do this problem so I will know how to do them for our test. Our book doesn't give a good example.
Homework Equations
I know gasses occupy 22.4 L at STP but other then that... I'm not sure how to set up this equation
The Attempt at a Solution
To calculate the volume of a gas at STP (Standard Temperature and Pressure), use the formula V = nRT/P, where V is the volume in liters, n is the number of moles of gas, R is the ideal gas constant, T is the temperature in Kelvin, and P is the pressure in atmospheres. At STP, the temperature is 273.15 K and the pressure is 1 atmosphere.
The ideal gas constant, denoted by the symbol R, is a physical constant that relates the properties of an ideal gas. It has the value of 0.08206 L·atm/mol·K or 8.314 J/mol·K.
To convert from Celsius to Kelvin, simply add 273.15 to the Celsius temperature. This is because the Kelvin scale starts at absolute zero, which is equivalent to -273.15 degrees Celsius.
No, STP and SATP are not the same. STP is defined as a temperature of 273.15 K and a pressure of 1 atmosphere, while SATP has a temperature of 298.15 K and a pressure of 1 bar (or 0.9869 atmospheres).
Yes, the ideal gas law can be used to calculate the volume of a gas at non-standard conditions. However, the values for temperature and pressure must be adjusted to reflect the actual conditions of the gas. Additionally, the ideal gas law assumes that the gas behaves in an ideal manner, which may not always be the case.