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1 answer:

7 0

De Broglie's wave equation describes that particles have wave properties. The equation is
λ = h/mv

Where λ is the wave length of the particle (m), h is the Planck's constant (6.62607 x 10⁻³⁴J s), m is the mass of a particle (kg) and v is the velocity (m/s).

λ = ?
h = 6.62607 x 10⁻³⁴ J s
m =200 g = 0.2 kg
v = 20 m/s

By substitution,
λ = 6.62607 x 10⁻³⁴ J s / (0.2 kg x 20 m/s)
λ = 1.66 x 10⁻³⁴ m

Hence, the wavelength of the 200 g ball 1.66 x 10⁻³⁴ m.

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If 0.905 mol Al2O3 is produced in the reaction, what mass of Fe in product's

Marrrta [24]

Answer: Amount of iron produced is 101.36 grams.

Explanation:

For the reaction of aluminium and iron oxide, the equation follows:

$2Al+Fe_2O_3\rightarrow Al_2O_3+2Fe$

By Stoichiometry of the reaction,

When 1 mole of aluminium oxide is produced, then 2 moles of iron is also produced.

So, when 0.905 moles of aluminium oxide is produced, then $\frac{ 2}{1}\times 0.905mol=1.81moles$ of iron is also produced.

Now, to calculate the amount of iron produced, we use the equation:

$\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}$

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Moles of iron = 1.81 moles

Putting values in above equation, we get:

$1.81mol=\frac{\text{Mass of iron}}{56g/mol}\\\\\text{Mass of iron produced}=101.36g$

Hence, amount of iron produced is 101.36 grams.

3 0

3 years ago

A compound is made up of only iron and oxygen. The ratio of iron ions to oxide ions is 2:3 in compound. The IUPAC name for this

Sergeu [11.5K]

Answer: iron (iii) oxide, Fe2O3.

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So the oxidation state of Fe in Fe2O3 is +3

So the name of the compound is iron (iii) oxide

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What is the volume of 25 g iodine, density = 4.93 g/cm^3??

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