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3 years ago

What is the percent by mass of carbon in C10 H14 N2?

2 answers:

8 0

Multiply the number of each element by its mass on the periodic table.

Add them together.

Put the mass of carbon only over the total mass and multiply the result by 100 to get the percentage.

Talja [164]3 years ago

7 0

Answer: The percentage by mass of carbon in the given compound is 45.8 %

Explanation:

We are given a chemical compound having chemical formula $C_{10}H_{14}N_2$

To calculate the percentage composition of an element in a compound, we use the equation:

$\%\text{ composition}=\frac{\text{Mass of carbon element}}{\text{Mass of compound}}\times 100$

In 1 mole of given compound, 10 moles of carbon atoms are there.

Mass of $C_{10}H_{14}N_2= [(10\times 12)+(14 \times 1)+(2\times 14)]=262g/mol$

Mass of carbon element = $[10\times 12]=120g/mol$

Putting values in above equation, we get:

$\%\text{ composition of carbon}=\frac{120}{262}\times 100=45.8\%$

Hence, percentage of carbon in given compound is 45.8 %.

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Look up the active ingredient in baking soda. Write a molecular and net ionic equation when that active ingredient is mixed with

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Answer:

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$Na^+$ and $HCO3^-$

when Baking soda reacts with Acetic acid

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NaHCO3(aq) + CH3COOH(aq) → Na(CH3COO)(aq) + CO2(g) +H2O(l)

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$Na^+ + HCO3^- + CH3COOH$ → $Na^+ + CH3COO^- +CO2 + H2O$

as $Na^+$ is present on both sides so it will cancel out and the net ionic equation will be

$HCO3^-(aq) + CH3COOH(aq)$ → $CH3COO^-(aq) + CO2(g) + H2O(l)$

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3 years ago

How does an elements period number related to the number of the energy level of its valence electrons?

Mrac [35]

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4 years ago

Describe the physical and chemical weathering

Stella [2.4K]

Answer:

Physical weathering is caused by purely mechanical changes to the rock, while chemical weathering is caused by chemical reactions.

Explanation:

Chemical weathering happens when the chemicals get diluted and dissolved in water and seep and percolate down the rock surfaces.

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3 years ago

Read 2 more answers

Consider the reaction CH4(g) 2O2(g)CO2(g) 2H2O(g) Using standard thermodynamic data at 298K, calculate the entropy change for th

zvonat [6]

Answer:

the entropy change for the surroundings when 1.62 moles of CH4(g) react at standard conditions is −8.343 J/K

Explanation:

The balanced chemical equation of the reaction in the question given is:

$CH_{4(g)} + 2O_{2(g)} \to CO_{2(g)} + 2 H_2O _{(g)}$