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Answer: 14.3%Explanation: In order to find the mass percent of hydrogen in this compound, you must determine how many grams of hydrogen you'd get in 100 g of compound.
In your case, you know that an unknown mass of hydrogen reacts with 0.771 g of carbon to form 0.90 g of hydrocarbon, which is a compound that contains only carbon and hydrogen.
Use the total mass of the hydrocarbon to determine how many grams of hydrogen reacted with the carbon.
Now, if 0.90 g of this compound contain 0.129 g of hydrogen, it follows that 100 g of this compound will contain.
So, if 100 g of this compound contain 14.33 g of hydrogen, it follows that the mass percent of hydrogen is 14.3%
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Answer:
2
Explanation:
The 1 & 2 are both signifigant becuase they are presented in scientific notation.
Dichotomous keys consist of a series of statements with two choices in each step that will lead users to the correct identification. So I believe your answer would be A.
Answer:
Total pressure in flask is 2.37 atm.
Explanation:
According to the Dalton's law of partial pressure, the total pressure of the flask would be the sum of partial pressure of the gases present in mixture.
P(total) = P1+ P2+P3+...Pn
n= number of gases present
Given data:
Pressure of argon gas = 0.72 atm
Pressure of oxygen gas = 1.65 atm
Total pressure in flask = ?
Solution:
P(total) = P (argon) + P (oxygen)
P(total) = 0.72 + 1.65
P(total) = 2.37 atm
