Molarity is a concentration unit, the number of moles of solute divided by the numbers of liters in a solution. Pertaining to chem
Answer: many of the chemicals found in urban air are formed by chemical reactions driven by sunlight.
Assuming we have 100 g of sample
30.45/MW of N 14g = 2.175
69.55/MW of O 16g = 4.34
4.34/2.185 = 2
for every 1 mole of N we have 2 moles of O
so the empirical formula would be NO2
without having the molecular weight of the entire molecule the molecular formula can not be determined with the information in your question
Answer : The weight of water is 9 g
Explanation:
According to avogadro's law, 1 mole of every substance weighs equal to its molecular mass and contains avogadro's number 
of particles.
To calculate the number of moles, we use the equation:
1 mole of water 
weighs = 18 g
0.5 moles of water weighs = 
Thus the weight of water is 9 g
