We assume that nitrogen gas sample here is an ideal gas. So that, we can use the ideal gas equation which is expressed as follows:
PV = nRT
First, we calculate the number of moles from the equation above. Then, use molar mass to calculate mass.
n = PV/RT
n = (745/760) (0.250) / 0.08206 (30+273.15)
n = 0.01 mol
m = 0.01 ( 28) = 0.28 g
Answer:
Our drinking water comes from lakes, rivers and groundwater. For most Americans, the water then flows from intake points to a treatment plant, a storage tank, and then to our houses through various pipe systems. A typical water treatment process.
Explanation:
الجواب هو الأول الجواب هو الأول
Answer:
A : Positively charged.
Explanation:
In a beta decay an unstable nucleus emits a beta particle (an electron or positron) to compensate the ratio between neutrons and protons in the atomic nucleus. In this case, a proton in the atomic nucleus becomes a neutron, by the emission of a positron(+e) accompanied by an antineutrino from the nucleus.
