Answer:
mass of oxygen gas in Kg = 15.0Kg
Explanation:
Volume of air in the room = 4.0m*5.0m*2.5m = 50m³
volume of oxygen in the room = 21/100 * 50m³ = 10.5m³
using the ideal gas equation; PV=nRT
number of moles of oxygen gas, n = PV/RT
At STP, P = 1atm, V = 10.5m³ = (10.5*1000)dm³ = 10500dm³, R = 0.082 atmdm³K⁻¹mol⁻¹, T = 273K
n = 1 * 10500/ (273 *0.082)
n = 469.04 moles
mass of oxygen gas in Kg = (no of moles * molar mass)/1000
molar mass of oxygen gas = 32g
mass of oxygen gas in Kg = (469.04 * 32)/1000
mass of oxygen gas in Kg = 15.0Kg
Answer:
349.503 g
https://www.convertunits.com/from/moles+Copper/to/grams
here is a link, you can convert moles of copper to grams here
The correct answers are:
1. C. during a new Moon;
The spring tides occur twice a month, after new Moon, and after full Moon. They cause the biggest differences in the high and low tides, with the high tides being abnormally high, and the low tides being abnormally low.
2. C. perigee;
The perigee is the point at which the Moon is closest to the Earth. This happens because the Earth is not right in the middle of the Moon's revolution, thus making one part of it being closer, and other part being further away.
3. C. sunrise;
The Moon has no influence on the sunrise whatsoever. The sunrise depends only on the movement of the Earth in comparison to the Sun, with the part is the becoming exposed to it as the Earth rotates being the part that is experiencing the sunrise.
Answer:
The atmosphere acts like a multi-layer shield that protects Earth from dangerous solar radiation. ... The stratospheric ozone layer absorbs ultraviolet (UV) radiation, preventing dangerous UV rays from hitting Earth's surface and harming living organisms. (Just look it up)
Explanation:
I hope this helps!
