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4 years ago

The atomic mass of iron is 55.85, and oxygen is 16.0. What is the mass of 6.02 × 1023 molecules of Fe2O3?

2 answers:

5 0

As there are two atoms of Fe and three atoms of O in the molecule of Fe2O3:
So,
Multiplying no of atoms with the molar mass ,
55.85 *2 + 3* 16 = 159.7g
So according to above explanation,
C. 159.7 g ,is the correct answer.

TiliK225 [7]4 years ago

4 0

Molar mass Fe2O3 = 55.85 x 2 + 16.0 x 3 => 159.7 g/mol

159.7 g ---------------- 6.02x10²³ molecules
( mass ) ------------- 6.02 x 10²³ molecules

mass = (6.02x10²³ ) x 159.7 / 6.02x10²³

mass = 9.61x10²⁵ / 6.02x10²³

= 159.7 g

answer C

hope this helps!

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Answer:

The right choice is c. Water molecules have a weakly positive hydrogen end.

Explanation:

The unequal sharing of electrons in water molecule gives a slight negative charge near its oxygen atom ( see image below) and a slight positive charge near its hydrogen atoms. A neutral molecule that has a partial positive charge at one end and a partial negative charge at the other, it is a polar molecule.

a. Water molecules have a nonpolar bond.

It is wrong choice because water has polar bond .

b. Water molecules have a weakly positive oxygen end.

Also, a wrong choice due to water molecule gives a slight negative charge near its oxygen atom.

c. Water molecules have a weakly positive hydrogen end.

This is the right choice.

d. Water molecules have two oxygen and two hydrogen atoms

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c. Water molecules have a weakly positive hydrogen end.

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4 years ago

Consider the combustion of octane (C8H18)

sesenic [268]

The balanced equation for the above reaction is as follows;
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stoichiometry of octane to CO₂ is 2:16
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when 2 mol of octane reacts it forms 16 mol of CO₂
therefore when 1.68 mol of octane reacts - it forms 16/2 x 1.68 = 13.45 mol of CO₂
number of CO₂ moles formed - 13.45 mol
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3 years ago

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3 years ago

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Answer:

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