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3 years ago

A student has 3.86 g of iron metal. How many moles of iron does the student have? Show your work.

Chemistry

1 answer:

GaryK [48]3 years ago

8 0

Answer:

The answer to your question is:

a) 0.069 moles of Iron

b) 0.052 moles of Oxygen

Explanation:

Data

mass Iron = 3.86 g

moles = ?

Atomic weight Fe = 56 g

Process

a) Solve it using a rule of three

56 g of Fe ---------------- 1 mol

3.86 g ---------------------- x

x = (3.86 x 1) / 56

x = 0.069 moles of Iron

Balanced Equation

4Fe + 3O₂ ⇒ 2Fe₂O₃

Solve it using a rule of three

4 moles of Fe ----------------- 3 moles of O₂

0.069 moles of Fe --------- x

x = (0.069 x 3) / 4

x = 0.052 moles of Oxygen

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The mole ratio for the reaction between $HNO_3$ and $Na_2CO_3$ is 1:2. This means 1 moles of $Na_2CO_3$ will neutralize 2 moles $HNO_3$ . Now we find the moles of each reactant based on the mass and molar mass.

$2500g HNO_3 \times \frac{mol}{63.01g\ HNO_3} = 39.67 mol\ HNO_3$

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3 years ago

When two moles of ethane react completely with oxygen, how many moles of carbon dioxide will be produced?A. 2.B. 4.C. 8.D. Unkno

babymother [125]

Answer:

Option B.

Explanation:

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shepuryov [24]

<u>Answer: </u>The correct statement is X is the effective nuclear charge, and it increases across a period.

<u>Explanation:</u>

We are given that:

X = number of protons − number of core electrons

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The formula used for the calculation of effective nuclear charge given by Slater is:

$Z^*=Z-\sigma$

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3 years ago