3 years ago

Help please!!! no links

Chemistry

1 answer:

Andre45 [30]3 years ago

5 0

I think the answer is B

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Which suitable method can be used to separate a mixture of sand and paraffin

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Answer:

filtration

Explanation:

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Leya [2.2K]

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3 years ago

According to collision theory, what must particles have in order to react when they collide? the particles must have sufficient

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If an atom has a diameter of 395 pm,<br> what is its radius?

joja [24]

Answer:

197.5pm

Explanation:

Given parameters:

Diameter of the atom = 395pm

Unknown:

Radius of the atom =?

Solution:

Radius is the half of diameter;

Radius = $\frac{diameter}{2}$

Radius = $\frac{395}{2}$ = 197.5pm

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3 years ago

If 43.7 g of iron is completely used to produce 62.5 g of iron (III) oxide, how many grams of oxygen are involved in the reactio

Kobotan [32]

Mass of Oxygen : 18.8 g

<h3>Further explanation</h3>

Reaction(balanced) :

4Fe + 3O₂ → 2Fe₂O₃

mass Fe = 43.7 g

mol Fe(MW= 55,845 g/mol) :

$\tt mol=\dfrac{mass}{MW}\\\\mol=\dfrac{43.7}{55.845}\\\\mol=0.783$

mol O₂ : mol Fe = 3 : 4, so mol O₂ :

$\tt \dfrac{3}{4}\times 0.783=0.5873$

Mass O₂(MW=32 g/mol) :

$\tt mass=mol\times MW\\\\mass=0.5873\times 32\\\\mass=18.7936~g\approx 18.8$

Or simply you can Conservation of mass, where the masses before and after the reaction are the same

<em>mass reactants=mass products</em>

mass iron+mass oxygen=mass iron (III) oxide

43.7 g + mass oxygen=62.5 g

mass oxygen = 62.5 - 43.7 = 18.8 g

5 0

3 years ago