Answer:
B : 0.133 M
Explanation:
moles Li3N3 = 0.4 mol Li x (2 moles Li3N/6 moles Li) = 0.133 M
Answer:
Methane -1,Ethene 2 , Ethane 2,Pentane 5,Propene 3,Hexane 6,Ethyne 2,Propane 3,Octane 8,Heptane 7 Decane 10,Butyne 4,Butane 4,Propyne 3,Butene 4
My Choice will be the sample C with a coefficient of absorption 62 % and the reason is that the percentage of the energy in an incident wave that remains in a reflected wave from this material is the smallest. Because this sample has the highest percentage of the coefficient of absorption than the other samples, As the sound Absorption coefficient is a part of the sound energy that absorbed by a material.And Its value varies with the angles of incident and frequency. So sample C is the best to be used as a soundproof room.
Weather
Explanation:
Meteorology is the study of weather.
Meteorologists are scientists that helps to predict weather phenomenon around us.
The use several data gathered from different weather stations around to make precise predictions about the likelihood of a particular weather condition.
Meteorologists most times use computer models to predict and forecast both long and short term weather conditions.
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This is an incomplete question, here is a complete question.
According to the EPA, the maximum contaminant level (MCL) of antimony in drinking water is 0.0060 mg/L.
Convert the MCL of antimony from milligrams per liter to parts per billion (ppb).
Answer : The maximum contaminant level (MCL) of antimony in drinking water in parts per billion is, 6 ppb
Explanation :
ppb : It is defined as the mass of solute present in per 1000 million 
of total mass.
1 ppb = 
As we know that:
1 milligrams per liter = 1000 parts per billion
or,
1 mg/L = 1000 ppb
As, 1 mg/L = 1000 ppb
So, 0.0060 mg/L = 
= 6 ppb
Thus, the maximum contaminant level (MCL) of antimony in drinking water in parts per billion is, 6 ppb
