- #1
markosheehan
- 136
- 0
Calculate the mass of 78 cm3 of oxygen at room temperature and pressure .
Im trying to work out the number of moles and then multiply by 32.
Im trying to work out the number of moles and then multiply by 32.
markosheehan said:Calculate the mass of 78 cm3 of oxygen at room temperature and pressure .
Im trying to work out the number of moles and then multiply by 32.
markosheehan said:Im sorry I am still confused. I know the right answer is .104g
markosheehan said:Thanks.
I feel the answer is wrong. 78/24000 ×32 is what gives the answer at the back of the book. Should it not be multiplied by 16 though because in the balanced equation for the reaction it's a half mile of oxygen is formed.?
To calculate oxygen mass at room temperature (RT) and pressure (P), you will need to use the ideal gas law, which is PV = nRT. In this equation, P represents the pressure, V represents the volume (in this case, 78 cm3), n represents the number of moles of oxygen, R is the universal gas constant, and T represents the temperature in Kelvin. You can rearrange this equation to solve for n, which is the number of moles of oxygen. Once you have the number of moles, you can then use the molar mass of oxygen (32 g/mol) to calculate the mass of oxygen.
The universal gas constant, represented by the symbol R, is a constant value used in the ideal gas law. It has a value of 0.0821 L·atm/mol·K or 8.3145 J/mol·K.
The molar mass of oxygen is approximately 32 g/mol. This means that one mole of oxygen atoms weighs 32 grams.
The temperature unit used in the ideal gas law is Kelvin (K). This is because Kelvin is the standard unit for measuring temperature in the scientific community and it is directly proportional to the average kinetic energy of gas particles.
The ideal gas law can be applied to most gases at low pressures and high temperatures. It is most accurate for monatomic gases, such as helium and neon, and less accurate for larger, more complex molecules. Additionally, it is not accurate for gases that are close to their boiling point or have strong intermolecular forces.