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Tanzania [10]
3 years ago
12

Help me please

Chemistry
1 answer:
Serhud [2]3 years ago
8 0

1.what is an atomic model ?

= <em>A </em><em>smallest</em><em> </em><em>particle </em><em>of</em><em> </em><em>an </em><em>element</em><em> </em><em>that</em><em> </em><em>can</em><em> </em><em>take</em><em> </em><em>part</em><em> </em><em>in</em><em> </em><em>chemical</em><em> </em><em>reaction</em><em> </em><em>without</em><em> </em><em>division</em><em> </em><em> </em><em>is</em><em> </em><em><u>known</u></em><em><u> </u></em><em><u>as</u></em><em><u> </u></em><em><u>atomic</u></em><em><u> </u></em><em><u>model</u></em><em><u> </u></em><em><u>.</u></em>

<em>2</em><em>.</em><em> </em>What is called atomic number and mass number?

=<em>The</em><em> </em><em>total</em><em> </em><em>number</em><em> </em><em>of </em><em>protons</em><em> </em><em>present</em><em> </em><em>in</em><em> </em><em>the</em><em> </em><em><u>nucleus</u></em><em><u> </u></em><em><u>of </u></em><em><u>an</u></em><em><u> </u></em><em><u>atom</u></em><em><u> </u></em><em><u>is</u></em><em><u> </u></em><em><u>known</u></em><em><u> </u></em><em><u>as</u></em><em><u> </u></em><em><u>atomic</u></em><em><u> </u></em><em><u>number</u></em><em><u> </u></em><em><u>.</u></em>

<em><u>=</u></em><em><u>The</u></em><em><u> </u></em><em><u>mass</u></em><em><u> </u></em><em><u>number</u></em><em><u> </u></em><em><u>of</u></em><em><u> </u></em><em><u>an</u></em><em><u> </u></em><em><u>atomic</u></em><em><u> </u></em><em><u>number</u></em><em><u> </u></em><em><u>is</u></em><em><u> </u></em><em><u>amu</u></em><em><u>.</u></em>

3. What is called an element?

=<em><u>An </u></em><em><u>element </u></em><em><u>is </u></em><em><u>the</u></em><em><u> </u></em><em><u>simplest</u></em><em><u> </u></em><em><u>pure</u></em><em><u> </u></em><em><u>form</u></em><em><u> </u></em><em><u>of</u></em><em><u> </u></em><em><u>a </u></em><em><u>substance</u></em><em><u> </u></em><em><u>which</u></em><em><u> </u></em><em><u>cannot</u></em><em><u> </u></em><em><u>be</u></em><em><u> </u></em><em><u>split</u></em><em><u> </u></em><em><u>up</u></em><em><u> </u></em><em><u>into</u></em><em><u> </u></em><em><u>other</u></em><em><u> </u></em><em><u>simpler</u></em><em><u> </u></em><em><u>substance</u></em><em><u> </u></em><em><u>by</u></em><em><u> </u></em><em><u>any</u></em><em><u> </u></em><em><u>chemical</u></em><em><u> </u></em><em><u>method.</u></em>

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The percent yield of copper hydroxide is 84%

<h3>Stoichiometry</h3>

From the question, we are to determine the percent yield of copper hydroxide

First, we will determine the theoretical mass

From the given balanced chemical equation, we have

Cu(NO₃)₂ + 2NaOH -- Cu(OH)₂ + 2NaNO₃

This means,

1 mole of copper(II) nitrate reacts with 2 moles of sodium hydroxide to produce 1 mole of copper hydroxide

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0.05 mole of copper(II) nitrate reacts with 0.1 mole of sodium hydroxide to produce 0.05 mole of copper hydroxide

The theoretical number of moles of copper hydroxide that is produced is 0.05 mole

Now, for the theoretical mass

Using the formula,

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Molar mass of copper hydroxide = 97.56 g/mol

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Theoretical mass = 0.05 × 97.56

Theoretical mass of copper of hydroxide produced is = 4.878 g

Now, for the percent yield of copper hydroxide

Percent yield is given by the formula,

Percent\ yield = \frac{Actual\ yield}{Theoretical\ yield} \times 100\%

Then,

Percent\ yield\ of\ copper\ hydroxide= \frac{4.1}{4.878}\times 100\%

Percent\ yield\ of\ copper\ hydroxide= 84\%

Hence, the percent yield of copper hydroxide is 84%.

Learn more on Stoichiometry here: brainly.com/question/9372758

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