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Delvig [45]
3 years ago
5

A metal oxide with the formula mo contains 15.44% oxygen. in the box below, type the symbol for the element represented by m.

Chemistry
2 answers:
lana66690 [7]3 years ago
8 0

<u>Answer:</u> The element represented by M is Strontium.

<u>Explanation:</u>

Let us consider the molar mass of metal be 'x'.

The molar mass of MO will be = Molar mass of oxygen + Molar mass of metal = (16 + x)g/mol

It is given in the question that 15.44% of oxygen is present in metal oxide. So, the equation becomes:

\frac{15.44}{100}\times (x+16)=16g/mol\\\\(x+16)=\frac{16g/mol\times 100}{15.44}\\\\x=(103.626-16)g/mol\\\\x=87.62g/mol

The metal atom having molar mass as 87.62/mol is Strontium.

Hence, the element represented by M is Strontium.

Simora [160]3 years ago
8 0

The metal present in the given metal oxide is strontium and its atomic symbol is  \boxed{{\text{Sr}}}.

Further explanation:

Mole is the measure of the amount of substance. Mole is the relation between the mass of the substance and molar mass of a substance. It is defined as the mass of a substance in grams divided by its molar mass (g/mol).

The expresion to calculate the number of moles is as follows:

{\text{Number of moles}}\;=\;\dfrac{{{\text{Given mass}}\left( {\text{g}}\right)}}{{{\text{molar mass}}\left({{\text{g/mol}}}\right)}}    ...... (1)

The given metal oxide MO contains 15.44 % oxygen, it means that 100 g of metal oxide MO contains 15.44 g of oxygen. The amount of metal present in 100 g of metal oxide is,

 \begin{aligned\text{Mass of metal}}\left( {\text{g}} \right)&=\left( {{\text{mass of metal oxide}}} \right)-\left( {{\text{mass of oxygen}}}\right)\\&=100{\text{ g}}-{\text{15}}{\text{.44 g}}\\&={\text{84}}{\text{.66 g}}\\\end{aligned}

The number of moles of oxygen in 100 g of metal oxide can be calculated by dividing mass of oxygen with molar mass of oxygen.

\begin{aligned}{\text{Number of moles}}\;&=\;\frac{{{\text{mass}}\left( {\text{g}} \right){\text{ of }}{{\text{O}}_2}}}{{{\text{molar mass}}\left( {{\text{g/mol}}} \right){\text{ of }}{{\text{O}}_2}}}\\&=\frac{{{\text{15}}{\text{.44 g}}}}{{16{\text{ g/mol}}}}\\&=0.965{\text{ mol}}\\\end{aligned}

According to the molecular formula of metal oxide MO, 1 mole of metal oxide contains 1 mole of oxygen and 1 mole of metal. Therefore, the number of moles of metal present in given metal oxide must be 0.965 moles.

The molar mass of metal can be calculated as follow:

\begin{aligned}{\text{Molar mass}}\left({{\text{g/mol}}}\right)&= \;\frac{{{\text{mass}}\left( {\text{g}} \right){\text{ of metal}}}}{{{\text{number of moles}}\left( {{\text{mol}}} \right)\;{\text{of metal}}}}\\&=\frac{{84.66{\text{ g}}}}{{0.965{\text{ mol}}}}\\&=87.7\,{\text{g/mol}}\\\end{aligned}

According to the periodic table metal which has a molar mass approximately 87.7 g is strontium (Sr). Hence the metal oxide is strontium oxide.

Learn more:

1. Determine the number of atoms in a molecule of white phosphorous.:brainly.com/question/9202946

2. Rank the gases in decreasing order of effusion:brainly.com/question/1946297

Answer details:

Grade: Senior school

Subject: Chemistry

Chapter: Mole concept

Keywords: Metal oxide, formula unit, MO, metal, symbol of metal, M, strontium, Sr, number of moles and strontium oxide.

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To formulate the empirical formula, we need to follow some steps:

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  • <u>Step 2:</u> Calculating the mole ratio of the given elements.

For the mole ratio, we divide each value of the moles by the smallest number of moles calculated which is 0.00775 moles.

For Carbon = \frac{0.023}{0.00775}=2.96\approx 3

For Hydrogen  = \frac{0.016}{0.00775}=2.06\approx 2

For Oxygen  = \frac{0.00775}{0.00775}=1

  • <u>Step 3:</u> Taking the mole ratio as their subscripts.

The ratio of C : H : O = 3 : 2 : 1

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For determining the molecular formula, we need to determine the valency which is multiplied by each element to get the molecular formula.

The equation used to calculate the valency is :

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