Divide the number of molecules you have by, 6.022 x 10^23. This will give you the moles of water, or the moles of anything, since there is always 6.022 x 10^23 molecules in 1 mole of substance.
1.23x10^24 atoms/6.022x10^23 atom/mole = 2.04 mole H20
The answer is, 699g
The idea here is that you need to use the mole ratio<span> tha exists between </span>ferric oxide<span>, </span><span><span>Fe2</span><span>O3</span></span><span>, and iron metal, </span>Fe<span>, to determine how many moles of the latter will be produced when </span>all the given mass<span> of the ferric oxide reacts...
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I would agree with the second one, not the first. You can't always see the chemical reaction, and it isn't always sudden. But the second claim is true.
Answer:
259.497 mg, 58.84%
Explanation:
BaSO₄ → Ba²⁺ + SO₄²⁻
to calculate the mole of BaSO₄
mole BaSO₄ = mass given / molar mass = 403 mg / 233.38 g/mol = 1.7268 mol
comparing the mole ratio
1.7268 mol of BaSO₄ yields 1.7268 mol of Ba²⁺
403 mg BaSO₄ yields ( 1.7268 × 137.327 ) where 137.327 is the molar mass of Barium mol of Ba²⁺
441 mg BaSO₄ will yield ( 1.7268 × 137.327 × 441 mg ) / 403 mg = 259 .497 mg
mas percentage of the Barium compound = 259 .497 mg / 441 mg × 100 = 58.84%
Answer:
Explanation:
Tarnish
ing
Tarnishing is a chemical property.
One substance changes into another substance with different properties. For example, the tarnish on silverware is formed by the reaction of silver with hydrogen sulfite to form black silver sulfide.
2Ag + H₂S ⟶ Ag₂S + H₂
Freezing
Freezing is a physical property, because the composition of the substance does not change. After liquid water has frozen to ice, it is still water, but in the solid state.
H₂O(ℓ) ⇌ H₂O(s)
Rusting
Rusting is a chemical property, because a new substance with different properties is formed.
A simple equation for the formation of rust is
2 Fe + 3O₂ + H₂O ⟶ Fe₂O₃·H₂O
