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3 years ago

Determine the number of protons and electrons for La3+

Chemistry

1 answer:

Yanka [14]3 years ago

7 0

Answer:

Ag+ = 47 electrons - 1 electron = 46 electrons. Finally: 47 protons , 61 neutrons and 46 electrons.

Explanation:

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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:

$C_5H_4$

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

$\frac{128.g/mol}{64.09g/mol} =2$

Therefore, the molecular formula is twice the empirical one:

$C_{10}H_8$

Regards!

8 0

3 years ago

When gases are compressed, the particles are forced closer together.

Elanso [62]

Gases can be compressed easily because there is a large amount of space between the individual molecules, which are very active and move around at high speed. When gases are compressed, the particles are forced much closer together, allowing a huge amount of particles to fit a small space.

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The density of helium in a balloon is 1.18 g/L. If a

marissa [1.9K]

There is 3.58 He in the balloon.

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3 years ago

Why is carbon dioxide used in fire extinguisher?

rjkz [21]

As Fire needs oxygen to burn, Carbon Dioxide Covers the fire like an blanket and cuts the contact of fire to the oxygen present in the air, So Fire stops burning.That is why Carbon Dioxide is Considere as the best Fire Extinguisher.

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3 years ago

Read 2 more answers

You want to prepare 500.0 mL of 1.000 M KNO3 at 20°C, but the lab (and water) temperature is 24°C at the time of preparation. Ho

timama [110]

Explanation:

As per the given data, at a higher temperature, at $24^{o}C$ , the solution will occupy a larger volume than at $20^{o}C$ .