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dolphi86 [110]
3 years ago
11

The percent composition of calcium is ?

Chemistry
1 answer:
DochEvi [55]3 years ago
5 0

Answer: 40.1%

Explanation: The mass of calcium in this compound is equal to 40.1 grams because there's one atom of calcium present and calcium has an atomic mass of 40.1 . The molar mass of the compound is 100.1 grams. Using the handy equation above, we get: Mass percent = 40.1 g Ca⁄100.1 g CaCO3 × 100% = 40.1% Ca.

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When a substance undergoes a chemical change, the product exhibits different physical properties than the starting material. Des
elena55 [62]

Answer:

I) Change in solubility

II) Change in boiling point

III) Change in colour

Explanation:

A chemical change involves formation of new products and is not reversible.

So, once two liquid solutions are mixed and a chemical change takes place, the new product will have the following:

- a new solubility rate, i.e it will dissolve at a rate different from the two liquid solution

- a new boiling point i.e it takes a new point at which its molecules liberate to yield vapour

- a new colour might be detected, as the individual solution each has its own colour

6 0
3 years ago
What's a vacuum exactly
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Answer:

Vacuum: space in which there is no matter or in which the pressure is so low that any particles in the space do not affect any processes being carried on there It is a condition well below normal atmospheric pressure and is measured in units of pressure (the pascal).-the internet gave me this answer so..

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7 0
3 years ago
What is the maximum amount in moles of P2O5 that can theoretically be made from 176 g of O2 and excess phosphorus?
Strike441 [17]

Answer:

<em>2</em><em>.</em><em>6</em><em>0</em><em> </em><em>mol</em><em>2</em>

Explanation:

2.60mol2 is ur answer

5 0
3 years ago
In the electron configuration 2-8-3-1, which shell contains electrons with the greatest energy?
natulia [17]
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3 years ago
Using the following equation for the combustion of octane, calculate the heat associated with the formation of 100.0 g of carbon
givi [52]

Answer: Heat associated with the formation of 100.0 g of carbon dioxide is 1563.2 kJ.

Explanation:

Reaction equation will be as follows.

    2C_{8}H_{18} + 25O_{2} \rightarrow 16CO_{2} + 18H_{2}O;  \Delta H^{o}_{rxn} = -11018 kJ

Mass of CO_{2} = 100 g

Hence, moles of CO_{2} present will be calculated as follows.

       No. of moles = \frac{mass}{\text{molar mass}}

                             = \frac{100 g}{44.0095 g/mol}

                             = 2.27 mol

Therefore, heat produced by 2.27 mol for the given reaction will be calculated as follows.

         2.27 mol \times \frac{11018 kJ}{16 mol CO_{2}}

             = 1563.2 kJ

Thus, we can conclude that heat associated with the formation of 100.0 g of carbon dioxide is 1563.2 kJ.

7 0
3 years ago
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