What is the mass in kilograms of air in a SCUBA tank that has a volume of 0.012

Question

What is the mass in kilograms of air in a SCUBA tank that has a volume of 0.012 m^3 and is pressurized to a density of 250 kg/m^3? kg Density is defined to be divided by volume. The relative humidity of an air parcel is 25% and the pressure is 1000 mb. If the pressure is increased to 1080 mb without changing the temperature or the water vapor content of the air, what is the relative humidity at the new pressure? Boyles law relates pressure and at constant and the number of moles of gas. Pressure and volume are related. How many days does sunlight take to travel the 50,000 AU from the sun to the outer reached of the Oort cloud? days (2 s f) The number of seconds to seconds in cross the distance is million seconds (2 s.f.). There are second in one year. One AU is billion meters. The luminosity of star A is 36 solar units and the luminosity of star B is 4 solar units. Both appear to have the same brightness from Earth. How far away is A compared to B? times as far. Luminosity is a measure of the total being emitted by a star. Brightness is a measure of luminosity of a star as seen by an earth-based observer. The usual unit of measure of luminosity is a comparison of the star in question to the Assume one light year equals 63,000 AU. If the diameter of the outer reaches of the Oort cloud is 100,000 AU, what is the approximate diameter expressed in light years? ly (2 s.f.). An astronomical unit is the average distance between the and the One astronomical unit equals billion meters (3 s.f.)

Explanation / Answer

According to the chegg guidelines I am allowed to answer only 1 question at a time .

1) V = 0.012 m^3 density = 250 kg /m^3

Mass = V * density = 0.012 m^3 * 250 kg /m^3 = 3.00 kg ============ANSWER)

Denisty is defined to be MASS divided by volume.

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