Answer:
Molarity = 8.89 mol/L
Explanation:
Given data:
Mass of hydrogen peroxide = 3%
Density = 1.01 g/mol
Molarity = ?
Solution:
3% hydrogen peroxide means 3 g of H₂O₂ are present in 100 g of solution.
Now we will calculate the moles of H₂O₂.
Number of moles = mass / molar mass
Number of moles = 3g/ 34 g/mol
Number of moles = 0.88 mol
Now we calculate the volume of solution.
d = m/v
v = m/ d
v= 100 g/ 1.01 g/ mL
v = 99 mL
In Litter
v = 99 / 1000 = 0.099 L
Molarity:
Molarity = number of moles / volume in L
Molarity = 0.88 mol/ 0.099 L
Molarity = 8.89 mol/L
Answer:
Caribe, Bermudas, Centroamérica incluyendo el este de México, las costas oriental y del Golfo de los Estados Unidos, y el este de Canadá.
Explanation:
Answer:
No
Explanation:
it will not be a irreversible change because u can give back the pen if it is in its original state and the shop keeper might accept it back that is what mostly happens. if the pen breaks or is used then it might me called a irreversible change until then it is reversible if not used yet.
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D. Substance 1 has a higher boiling point than Substance
Explanation:
Substance 1 and 2 compare in that substance 1 has a higher boiling point than substance 2. This separation technique is called distillation.
- In distillation, mixtures are separated based on the differences in their boiling points.
- The liquid with the lowest boiling point vaporizes and rises in the column first.
- It is the condensed back and collected.
- At the boiling point of each liquid, they rise from the mixture and are culled out.
Learn more:
Mixtures brainly.com/question/1446244
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Answer:
Explanation:
To convert from moles to atoms, we must use Avogadro's Number. <u>Avogadro's Number</u>
- 6.022*10²³
- The number of particles (atoms, molcules, ions, etc.) in 1 mole.
- In this case, it is the number of atoms of lead.
1. Set up ratio
We can use Avogadro's Number as a fraction or ratio.
2. Convert atoms to moles
Multiply the given number of atoms by the ratio.
Flip the fraction so that the atoms of lead can cancel each other out.
3. Round
The original measurement of 4.75 had 3 significant figures (4, 7, and 5).
We must round our answer to 3 sig figs, which is the hundredth place for the number found.
The 7 in the thousandth place tells us to round the 8 up to a 9 in the hundredth place.
There are <u>7.89*10⁻⁴ moles of lead</u> in 4.75*10²⁰ atoms of lead.