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kow
1 month ago
12

A large weather balloon filled with helium has a volume of 7.00 x 102 L at STP. Which expression should be used to find the mass

of helium in the balloon?
Chemistry
1 answer:
Anarel [2.9K]1 month ago
7 0
mass of Helium = moles of Helium x molar mass of Helium. Moles of Helium equal the volume of Helium divided by 22.4 dm^3/mol, yielding 7.00 x 10^2 / 22.4 = 31.25 mol. Consequently, mass of Helium is found by multiplying the amount of moles by the molar mass, resulting in 31.25 mol x 4 g/mol equaling 125 g.
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How many moles of copper would be needed<br> to make 1 mole of Cu,O?
castortr0y [3046]
You can find further information regarding each unit of measurement: the molecular weight of Copper(I) Oxide or grams. The molecular formula for Copper(I) Oxide is Cu2O. The SI base unit for the amount of substance is the mole. One mole translates to 1 mole of Copper(I) Oxide, equating to 143.0914 grams.
4 0
1 month ago
In an acid-base neutralization reaction 43.74 ml of 0.500 m potassium hydroxide reacts with 50.00 ml of sulfuric acid solution.
lorasvet [2795]
The neutralization reaction that occurs between potassium hydroxide and sulfuric acid can be represented as follows
2KOH + H2SO4 ---> K2SO4 + 2H2O

The quantity of moles of KOH is calculated using (43.74 x 0.500)/ 1000 = 0.02187 moles

Given that the stoichiometric ratio of KOH to H2SO4 is 2:1, the moles of H2SO4 can be determined as 0.02187/2 = 0.01094 moles

To find the concentration (molarity), use the formula (0.01094/50) x 1000 = 0.2188M
7 0
2 months ago
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Sample (3.585g) contains 1.388g of C, 0.345g of H, 1.850g of O and its molar mass is 62g. What is the molecular formula of this
lions [2927]
The molecular formula is C2H6O2

Attached is the solution:

Initially, convert the mass into moles.

Then, divide each mole by the smallest amount to identify the number of atoms in the empirical formula.

Next, calculate the empirical formula mass.

Then, determine the molecular formula by dividing the molar mass by the empirical formula mass.

Finally, multiply the empirical formula by the obtained answer to arrive at the molecular formula of the compound.

6 0
1 month ago
A hydrogen atom has a diameter of about 10 nm. Express this diameter in micrometers, meters, and millimeters.
KiRa [2933]

1) 1 nm = 0.001 µm; which indicates that one nanometer equals 0.001 (10⁻³) micrometer.

d(H) = 10 nm; the diameter of a hydrogen atom.

d(H) = 10 nm · 0.001 µm/nm.

d(H) = 0.01 µm = 10⁻² µm.

2) 1 nm = 10⁻⁹ m; illustrating that one meter is equivalent to 0.000000001 (10⁻⁹) meter.

d(H) = 10 nm.

d(H) = 10 nm · 10⁻⁹ m/nm.

d(H) = 0.00000001 m = 10⁻⁸ m.

3) 1 nm = 10⁻⁶ mm; showing that a nanometer corresponds to 0.000001 (10⁻⁶) millimeter.

d(H) = 10 nm · 10⁻⁶ mm/nm.

d(H) = 0.00001 mm = 10⁻⁵ mm.

4 0
2 months ago
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