An element, X, has 2 isotopes, X-32 with an abundance of 31.5% and X-35 with an abundanceof 68.5%. What is the average atomic mass of element X?
Answers
Answer:
amu = 34.055 or 34.1
Explanation:
to calculate the average mass, first convert the percentages into decimals. Then, calculate the mass numbers. To get this number, multiply the decimal by the mass number for each isotope and, then add them together.
( 0.315 x 32 ) + (0.685 x 35 ) = 34.055
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A 55.0 g piece of iron at 505 ° C is put into 735 grams of water at 15.0 ° C. What is the final temperature of the water and the iron?
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Answers
First you need to find the number of moles of potassium that is present in a 6.75g sample. To do this you need to divide the mass of potassium (6.74g) by its molar mass (39.1g/mol) to get 0.172mol K. Since we are told that the reaction happens with excess chlorine we know that potassium is the limiting reagent and we can therefore ignore chlorine gas and convert the moles of potassium straight to the moles of potassium chloride. Since we know that 2 moles of potassium creates 2 moles of potassium chloride we can say that 0.172mol K turns into 0.172mol KCl since the molar ratio is 2/2 which can be thought of as 1. The final step is to multiply 0.172mol KCl by its molar mass (74.55g/mol) to get 12.85g of potassium chloride.
I hope this helps. Let me know in the comments if anything is unclear.
75 K and 500 kPa
2
150. Kand 500 kPa
3
300. Kand 50 kPa
4
600. K and 50 kPa
Submit Answer
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600k as well as 50kPa since the pressure seems to be the lowest as well as the temperature is the greatest throughout this situation.
Under high temperatures and low pressures, actual gases behaved like ideal gases. such as the rule
Even though at high temperatures, the kinetic energy of such gas particles surpasses the intermolecular attractive forces, — in other words this same potential energy of something like the molecules (gaseous).
Thus the above answer i.e., "option 4" is right.
Learn more:
Answer: 600K and 50kPa
Explanation:
The volume of one mole of gas at STP is 22.4 liters.
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1 mol at STP is equivalent to 22.4 liters.
So, 5*22.4 liters of O2 produces 4*22.44 liters of CO2
Then 60 liters of O2 produces 60*4/5 = 48 liters of CO2
Final answer:
In the combustion reaction of acetylene (C2H2), 60 liters of CO2 will be produced if 60 liters of O2 is used.
Explanation:
To determine the volume of CO2 produced in the combustion reaction of acetylene (C2H2), we need to use stoichiometry. From the balanced equation, we can see that 2 moles of C2H2 produce 4 moles of CO2. The ratio is 2:4 or 1:2. Given that 60 liters of O2 is used, we can assume the same volume of CO2 will be produced since both gases are at STP.
Therefore, the volume of CO2 produced would be 60 liters as well.
Keywords: combustion, volume, acetylene, O2, CO2, STP
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Answer: C
Explanation:
This is basic stoichiometry
4.5 X 10^20 Atoms x (1 mole/ 6.02 X 10^23 atoms) = 7.48 X 10^-4 moles Ag
so the answer would be C.
Answers
Astrology is not a science, astronomy is a science.
Astrology is more related to myths, legend and human interpretation of the sky, universe, planets.
Answer:
D. use of astrology to predict the personality of a child