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____ [38]
3 years ago
10

Which elements in the periodic table are metalloids or have semimetallic properties?

Chemistry
1 answer:
inessss [21]3 years ago
3 0
B, As only are metalloids or have semimetallic properties.
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Phosphine, an extremely poisonous and highly reactive gas, will react with oxygen to form tetraphosphorus decaoxide and water. P
pantera1 [17]

Answer:

The mass of P₄O₁₀ (s) formed is 471.03 g

Explanation:

4PH₃(g) + 8O₂(g) →  P₄O₁₀ (s)  + 6H₂O (g)

This is the ballanced equation.

Every 4 moles of phosphine, 1 mol of tetraphosphorus decaoxide is generated.

Moles of PH₃ = Mass PH₃ / Molar mass PH₃

Moles PH₃ = 225 g / 33.9 g/m

Moles PH₃ = 6.63 moles

So the rule of three, will be:

If 4 moles of PH₃ generate 1 mol  P₄O₁₀

Then, 6.63 moles of  PH₃ generate (6.63  .1)/4 = 1.66 moles

If we want to know the mass:

Moles . Molar mass = mass

Molar mass  P₄O₁₀  = 283.88 g/m

1.66m  . 283.88 g/m = 471.03 g

3 0
3 years ago
a sample of a substance has a mass of 52.5g and displaces a volume of 4.2ml. what is the density of the substance
Lena [83]

Answer:

<h2>Density = 12.5 g/mL</h2>

Explanation:

The density of a substance can be found by using the formula

Density =  \frac{mass}{volume}

From the question

mass = 52.5 g

volume = 4.2 mL

Substitute the values into the above formula and solve for the density

We have

Density =  \frac{52.5}{4.2}  \\

We have the final answer as

<h3>Density = 12.5 g/mL</h3>

Hope this helps you

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4 years ago
Molecules formed by atoms of two or more different molecules are _______.
mezya [45]

Answer:Diatomic molecules i think

Explanation:

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the molar mass of a compound can be caucaleted by adding the standar atomic masses.

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Acid rain has no effect on limestone. So nothing happens.
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