Chemistry, 14.07.2019 04:30 sarahhmao

"how many moles of calcium atoms are in 2.5 moles of calcium carbonate caco3"

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Answer from: Suphat

Moles are the mass and the molecular mass ratio of the substance. In 2.5 moles of calcium carbonate, 2.5 moles of calcium atoms are present.

What are moles and molecular mass?

Moles are the units of the calculation of the number of molecules and atoms in a substance. Molar mass is the addition of all the constituent atomic mass of the compound.

The chemical formula for calcium carbonate is $\rm CaCO_{3}.$ From this, it can be said that,

1 mole of calcium carbonate contains 1 mole of calcium

So, 2.5 moles of calcium carbonate will contain x moles of calcium

Solving for x:

$\begin{aligned} \text{moles of x} &= 2.5 \;\rm moles \times \dfrac{ 1\;\rm mole \;\rm Ca}{ 1\;\rm mole \;\rm CaCO_{3}}\\\\&= 2.5\;\rm moles\end{aligned}$

Therefore, 2.54 moles of calcium is present.

Learn more about moles here:

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Answer from: jose477

2.5 moles of calcium atoms are in 2.5 moles of calcium carbonate CaCO₃

Explanation: -

In order to solve such types of problems, the first step would be to write the chemical formula of the compound.

The chemical formula of calcium carbonate = CaCO₃

The chemical symbol of Calcium is Ca.

From the formula of calcium carbonate we can see that

1 mole of CaCO₃ has 1 mole of Ca

2.5 mole of CaCO₃ has $\frac{1 mole Ca }{1 mole CaCO₃} x 2.5 mole CaCO₃$

= 2.5 mol of Ca.

∴2.5 moles of calcium atoms are in 2.5 moles of calcium carbonate CaCO₃

Answer from: Quest

question: ray weighs 100 kilograms, his wrestling partner, bobby, weighs 50 kilograms. if ray moves at 4 m s , how fast will bobby have to run at him to apply an equal amount of kinetic energy?

answer: 8 m/s he needs to run twice as fast to keep up so he has some work to do

explanation: if the mass has units of kilograms and the velocity of meters per second, the kinetic energy has units of kilograms-meters squared per second squared.

question answered by

(jacemorris04)

Answer from: Quest

The air is going to come out because of the low pressure.

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