How many moles of NO3 are there in 6.2g?
Answers
Answer : The number of moles of is, 0.1 moles
Solution : Given,
Mass of = 6.2 g
Molar mass of = 62 g/mole
Now we have to calculate the moles of .
Therefore, the number of moles of present in 6.2 g is, 0.1 moles
Related Questions
I need help please Which option is chemical change?
Which of the following molecules has a bent structure?A. O2 B. CO2 C. H2O D. CH4
An illegal drug stimulates the parasympathetic nervous system, causing the user to appear tranquilized. What could indicate to a paramedic whether or not the person took this drug?A. High blood pressure and droolingB. Low blood pressure and droolingC. High blood pressure and dry mouthD. Low blood pressure and dry mouth
How can you tell which ionic compounds will react in an aqueous solution
Answers
Separate Salt and Water Using Distillation
If you want to collect the water, you can use distillation. This works because salt has a much higher boiling point than water. One way to separate salt and water at home is to boil the salt water in a pot with a lid.
hope this helps!!
Final answer:
To separate salt from water, you can use evaporation or filtration.
Explanation:
To separate the salt from the water, you can use the processes of evaporation and filtration.
- Evaporation: You can heat the saltwater solution to boil off the water and leave behind the salt as solid crystals. The water evaporates and can be collected as a vapor if desired.
- Filtration: Alternatively, you can use a filter to separate the solid salt particles from the liquid water. The saltwater solution is poured through the filter, which traps the salt while allowing the water to pass through.
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Answers
Answer:
protons: 36
neutrons:48
electrons:36
Explanation:
the number of protons in an element is = to the atomic # (36)
the number of neutrons is the atomic mass - atomic # (84-36=48)
In a neutral charged element the # of protons = # of electrons
Answers
b. two significant figures.
c. three significant figures.
d. five significant figures.
Answers
a. One significant figure:
- Expressing 385,500 as 3.9 × 10^5 hours (rounded to one significant figure).
b. Two significant figures:
- Expressing 385,500 as 3.9 × 10^5 hours (rounded to two significant figures).
c. Three significant figures:
- Expressing 385,500 as 3.86 × 10^5 hours (rounded to three significant figures).
d. Five significant figures:
- Expressing 385,500 as 3.8550 × 10^5 hours (rounded to five significant figures).
Keep in mind that the exponential notation represents the same value but with the specified number of significant figures.
Isotopic Natural
Mass Abundance
Number %
1 39 78.8
2 40 18.1
3 41 3.1
what is the atomic weight
Answers
39 x .788 = 30.732
40 x .181 = 5.43
41 x .031 =+ 1.24
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39 since there are only 2 significant figures given for each mass
Final answer:
The atomic weight of a hypothetical element with isotopes of masses 39, 40, and 41 and natural abundances of 78.8%, 18.1%, and 3.1% respectively, is approximately 39.243 atomic mass units (amu).
Explanation:
To calculate the atomic weight of an element from its isotopes' masses and abundances, use the formula: atomic weight = (mass1 x abundance1) + (mass2 x abundance2) + ... (massn x abundancen), where the masses are the isotopes' masses and the abundances are given as proportions (i.e., percentages divided by 100).
Using the values from your question, the calculation would be as follows:
Atomic weight = (39 x 0.788) + (40 x 0.181) + (41 x 0.031) = 30.732 + 7.24 + 1.271 = 39.243. So, the atomic weight of the hypothetical element is approximately 39.243 atomic mass units (amu).
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A) Roger is incorrect. The melting wax is a physical change but there is no chemical change taking place.
B) Roger is correct. Lighting the match is a chemical change and burning the candles is a physical change.
C) Roger is correct. The melting wax is a physical change and the burning candle wick is a chemical change.
D) Roger is incorrect. Only a chemical change is taking place as evidenced by the light and heat of the burning candles.
Answers
Melting of wax is a physical change and chemical change is the burning of candle.
What is chemical and physical changes?
Chemical changes are those changes by which composition of the original matter changes and physical changes are those changes by which only appearance of the matter changes.
In the given activity:
- Melting of wax is a physical change because during this composition of wax not changes but only outer structure changes.
- Burning of candle and lighting the match are chemical change as it produces energy in the form of heat and light.
Hence, Roger is correct ie. The melting wax is a physical change and the burning candle wick is a chemical change.
To know more about physical and chemical changes, visit the below link:
brainly.com/question/17166994
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