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2 years ago

The table compares some characteristics of two atoms.

Chemistry

2 answers:

11Alexandr11 [23.1K]2 years ago

5 0

Answer:

Atoms X and Atom Y are isotope is right answer

Tanya [424]2 years ago

3 0

Answer: Option (c) is the correct answer.

Explanation:

As it is known that mass number means the sum of total number of protons and neutrons present in an atom.

Whereas atomic number means only total number of protons.

As it is given that mass number of element X is 7 and neutrons present in it are 4. Hence, its atomic number will be calculated as follows.

Atomic number = Mass number - no. of neutrons

= 7 - 4

= 3

Now, it is given that mass number of element Y is 9 and neutrons present in it are 5. Hence, its atomic number will be calculated as follows.

Atomic number = Mass number - no. of neutrons

= 9 - 5

= 4

Therefore, atomic number of element X is 3 and atomic number of element Y is 4. So, it means both these elements are present in same period.

Thus, we can conclude that it is true about the two atoms that atom X and Atom Y are in the same row on the periodic table.

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How many neutrons would an atom of fluorine have?

lord [1]

Answer:

Explanation:

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2 years ago

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A chemical formula shows the kinds and numbers of _____ in the smallest representative unit of a substance.

Firdavs [7]

A chemical formula shows the kinds and numbers of atoms in the smallest representative unit of a substance.

Explanation:

In chemistry, a formula unit is the empirical formula of "ionic or covalent network solid compound" that is used as an independent entity for "stoichiometric calculations". This formula is a representation of a molecule that uses chemical symbols.

The unit is the lowest whole number ratio of ions represented in an ionic compound. It gives the numbers of atoms representing the "smallest representative" unit of a substance. The number of atoms also tells us about the chemical and physical properties of the compound formed.

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3 years ago

Liquid hexane

maks197457 [2]

Answer: The mass of $H_2O$ produced is 2.52 g

Explanation:

The number of moles is defined as the ratio of the mass of a substance to its molar mass. The equation used is:

$\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}$ ......(1)

For hexane:

Given mass of hexane = 1.72 g

Molar mass of hexane = 86.18 g/mol

Putting values in equation 1, we get:

$\text{Moles of hexane}=\frac{1.72g}{86.18g/mol}=0.020mol$

For oxygen gas:

Given mass of oxygen gas = 8.0 g

Molar mass of oxygen gas= 32 g/mol

Putting values in equation 1, we get:

$\text{Moles of water}=\frac{8.0g}{32g/mol}=0.25mol$

The chemical equation for the combustion of hexane follows:

$2C_6H_{14}+19O_2\rightarrow 12CO_2+14H_2O$

By stoichiometry of the reaction:

If 2 moles of hexane reacts with 19 moles of oxygen gas

So, 0.020 moles of hexane will react with = $\frac{19}{2}\times 0.020=0.19mol$ of oxygen gas

As the given amount of oxygen gas is more than the required amount. Thus, it is present in excess and is considered as an excess reagent.

Thus, hexane is considered a limiting reagent because it limits the formation of the product.

By the stoichiometry of the reaction:

If 2 moles of hexane produces 14 moles of $H_2O$

So, 0.020 moles of hexane will produce = $\frac{14}{2}\times 0.020=0.14mol$ of $H_2O$

We know, molar mass of $H_2O$ = 18 g/mol

Putting values in above equation, we get:

$\text{Mass of }H_2O=(0.14mol\times 18g/mol)=2.52g$

Hence, the mass of $H_2O$ produced is 2.52 g

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3 years ago

What are the functions of ammonia in the solvay process

enot [183]

The ammonia gas is absorbed in the concentrated brine to produce aqueous sodium chloride and aqueous ammonia. This ammoniation process is exothermic, so energy is released as heat. The ammonia tower eventually needs to be cooled.

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3 years ago

HELP ASAP PLEASE PLEASE PLEASE Complete and balance the following reaction. Note that Cr forms +3 in the product. ____ Sn(NO3)2

Rzqust [24]

Answer:

Explanation:

3Sn(NO3)2 (aq) + 2Cr(s) → 2Cr(NO3)3(aq ) + 3Sn(S )

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3 years ago