Answer: How to calculate the mass percent by using these instructions
1.The molar mass is the mass of a given chemical element or chemical compound (g) divided by the amount of substance (mol).
2.The molar mass of a compound can be calculated by adding the standard atomic masses (in g/mol) of the constituent atoms.
Explanation:
Answer: B
Molarity is defined as M=(m/mw)/L solution where M is molarity, m is weight, mw is molar weight and L is liters.
First we plug in the mass, which is 5, then divide by the molar weight of 39.9969 which can just be rounded to 40.
Then we convert 750mL to liters which would be 0.75 liters. The root "milli" is x10-3, therefore we convert it to become 0.75L.
Now we just solve the equation, 5/40/0.75 is 0.166 repeating decimal, or just 0.167 rounding to three significant digits.
Answer:
Base
Explanation:
Why is Alka-Seltzer a base?
Alka-Seltzer contains sodium bicarbonate and citric acid. The sodium citrate acts as an antacid. Excess sodium bicarbonate from the Alka-Seltzer acts to neutralize base.
Answer:
0.55 atm
Explanation:
According to Dalton's law of partial pressures,
The total pressure is the summation of the partial pressures of individual gases in a sample of non-reactive gases.
Since Neon and Argon are noble gases, they do not react with each other. So we can apply Dalton's partial pressure law.
P total = P Ar + P Ne
2.39 atm = P Ar+ 1.84 atm
P Ar = 2.39 atm - 1.84 atm
= 0.55 atm