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3 years ago

John is lifting a 1.5 kg toy to a height of 1.2 m above the ground. How much work is done??

Chemistry

1 answer:

sveticcg [70]3 years ago

7 0

1.5*9.8*1.2

since the formula is force * distance.

1.2 is the distance. the force is gravity on the object (1.5*9.8)

The answer is 17.64 J . (18 J with sig figs)

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An unknown compound contains 38.7 % calcium, 19.9 % phosphorus and 41.2 % oxygen. what is the empirical formula of this compound

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We assume that the sample is 100.0 g.

The sample contains 38.7 g of Ca, 19.9 g of P, and 41.2 g of O as the proportions show.

Then we can calculate the number of moles of each component (n = m/atomic mass).

The number of moles of Ca = 38.7/40.078 = 0.96 mol.

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Now, we can get the molar ratios of different components (Ca, P, and O) in the sample by dividing the number of moles of each component by the lower number of moles, that we should divide the number of moles by (0.64).

Ca: P: O = (0.96/0.64) : (0.64/0.64) : (2.75/0.64) = 1.5 : 1 : 4.

To avoid the fraction of the ratios, we can multiply all ratios by 2.0.

Now, the ratio of Ca : P : O will be 3 : 2 : 8.

That main the empirical formula of the compound is Ca3P2O8 which can be expressed as calcium phosphate (Ca3(PO4)2).

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2 years ago

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Answer:

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Explanation:

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