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8_murik_8 [283]

3 years ago

5

What is the relationship between the period and the orbital radius? Select one: a. It is a direct relationship- As the period in

creases the orbital radius also increases. b. It is an inverse relationship- As the period increases the orbital radius decreases.

1 answer:

Nezavi [6.7K]3 years ago

3 0

It is an inverse relationship as the period increases the orbital radius decreases

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A compound contains sodium, boron, and oxygen. An experimental analysis gave values of 53.976 % sodium and 8.461 % boron, by wei

sveticcg [70]

Answer : The empirical formula of a compound is, $Na_3BO_3$

Solution : Given,

If percentage are given then we are taking total mass is 100 grams.

So, the mass of each element is equal to the percentage given.

Mass of Na = 53.976 g

Mass of B = 8.461 g

Mass of O = [100 - (53.976 + 8.461)] = 37.563 g

Molar mass of Na = 23 g/mole

Molar mass of B = 11 g/mole

Molar mass of O = 16 g/mole

Step 1 : convert given masses into moles.

Moles of Na = $\frac{\text{ given mass of Na}}{\text{ molar mass of Na}}= \frac{53.976g}{23g/mole}=2.347moles$

Moles of B = $\frac{\text{ given mass of B}}{\text{ molar mass of B}}= \frac{8.461g}{11g/mole}=0.769moles$

Moles of O = $\frac{\text{ given mass of O}}{\text{ molar mass of O}}= \frac{37.563g}{16g/mole}=2.347moles$

Step 2 : For the mole ratio, divide each value of moles by the smallest number of moles calculated.

For Na = $\frac{2.347}{0.769}=3.05\approx 3$

For B = $\frac{0.769}{0.769}=1$

For O = $\frac{2.347}{0.769}=3.05\approx 3$

The ratio of Na : B : O = 3 : 1 : 3

The mole ratio of the element is represented by subscripts in empirical formula.

The Empirical formula = $Na_3B_1O_3$ = $Na_3BO_3$

3 0

3 years ago

Read 2 more answers

Why do people make mixtures

riadik2000 [5.3K]

Because they want to combine two or more things.

7 0

2 years ago

What represents the different forms of electromagnetic radiation

laila [671]

The different types of electromagnetic radiation shown in the electromagnetic spectrum consists of radio waves, microwaves, infrared waves, visible light, ultraviolet radiation, X-rays, and gamma rays.

5 0

3 years ago

The reaction below shows how silver chloride can be synthesized. AgNO3 NaCl Right arrow. NaNO3 AgCl How many moles of silver chl

Otrada [13]

From 15 mol of Silver nitrate, the moles of silver chloride produced have been 15 mol. Thus, option B is correct.

The balanced chemical reaction for the synthesis of silver chloride has been:

$\rm AgNO_3\;+\;NaCl\;\rightarrow\;AgCl\;+\;NaNO_3$

From the balanced equation, since there has presence equal moles of silver nitrate and sodium chloride, the moles of silver chloride formed has been equivalent. Thus, 1 mole of silver nitrate gives 1 mole of silver chloride.

The moles of silver nitrate available are, $\rm M_A_g_N_O_3=15\;mol$

The moles of silver nitrate produced can be given as:

$\rm 1\;mol\;AgNO_3=1\;mol\;AgCl\\15\;mol\;AgNO_3=15\;\times\;1\;mol\;AgCl\\15\;mol\;AgNO_3=15\;mol\;AgCl$

Thus, the moles of silver chloride produced have been 15 mol. Thus, option B is correct.

For more information about moles produced, refer to the link:

brainly.com/question/10606802

7 0

2 years ago

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A chemical change involves a change in ________. A chemical change involves a change in ________. phase the elements of a molecu

Firlakuza [10]

Answer:

All of the above.

Explanation:

Chemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances.

This process is not reversible and a change of energy that is sometimes heat is given off.

4 0

3 years ago