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3 years ago

How many total atoms are in 0.720 g of p2o5

Chemistry

2 answers:

Katarina [22]3 years ago

5 0

Answer:

$4.92x10^{23}atoms,total$

Explanation:

Hello,

The following mole-mass relationship is applied to find the atoms of P and O, taking into account that the molar mass of P2O5 is 78g/mol:

$M_{P_2O_5}=31*2+16*5=78g/mol\\atoms_{P}=0.720gP_2O_5*\frac{1molP_2O_5}{78gP_2O_5} *\frac{2molP}{1molP_2O_5}*\frac{6.022x10^{23}atoms P}{1molP} =4.82x10^{22}atoms P\\atoms_{O}=0.720gP_2O_5*\frac{1molP_2O_5}{78gP_2O_5} *\frac{5molO}{1molP_2O_5}*\frac{6.022x10^{23}atoms O}{1molO} =1.2x10^{23}atoms O$

Now, by adding those atoms, one concludes:

$1.2x10^{23}atoms O+4.82x10^{22}atomsP=4.92x10^{23}atoms,total$

Best regards.

11Alexandr11 [23.1K]3 years ago

3 0

The total is 7 atoms in all

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3 years ago

6.50 g of a certain Compound x, known to be made of carbon, hydrogen and perhaps oxygen, and to have a molecular molar mass of 1

gayaneshka [121]

Answer:

$C_{10}H_8$

Explanation:

Hello there!

In this case, according to the given information, it turns out possible for us to find the molecular formula of the given compound by firstly calculating both moles and grams of carbon in carbon dioxide and hydrogen in water, as the only sources of these elements derived from the compound x due to its combustion:

$n_C=22.35gCO_2*\frac{1molCO_2}{44.01gCO_2}*\frac{1molC}{1molCO_2}=0.51molC\\\\m_C=0.51molC*\frac{12.01gC}{1molC} =6.10gC$

$n_H=3.66gH_2O*\frac{1molH_2O}{18.02gH_2O}*\frac{2molH}{1molH_2O}=0.41molH\\\\m_H=0.41molH*\frac{1.01gH}{1molH}=0.41g$

Now, since the addition of carbon and hydrogen is about 6.50 grams, we infer the compound has no oxygen, that is why we now set the mole ratios in the empirical formula for both C and H as shown below:

$C:\frac{0.51mol}{0.41mol}= 1.24\\\\H:\frac{0.51mol}{0.51mol}= 1\\\\C_{1.24}H$

Yet it cannot be decimal, that is why we multiply by 4 to get the correct whole-numbered empirical formula:

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Whose molar mass is 64.09 g/mol, which makes the ratio of molar masses:

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Regards!

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3 years ago

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Olenka [21]

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Nuclear energy refers to the energy which is produced as a result of the changes that occur in the nucleus of atoms of elements.

Nuclear energy produces the largest amount of energy when compared to other forms of energy sources.

Nuclear energy is produced by two types of nuclear reactions:

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Nuclear energy is also harmful because nuclear energy has been employed in the production of atomic bombs and hydrogen bombs.

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2 years ago

Paladinen [302]

Answer:

$\boxed{\text{452 mg}}$

Explanation:

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kupik [55]

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4 years ago