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1 year ago

Determine the empirical formula for a compound that is 64.8% C, 13.6% H, and 21.6% O by mass.

Chemistry

1 answer:

True [87]1 year ago

8 0

Answer:

C4H10O

In case it's not understandable: c four, h ten, no

Explanation:

Molar mass of each component: C = 12.0107, H = 1.00794, O = 15.9994

Convert to moles: C = 5.3951892895502, H = 13.492866638887, O=1.3500506268985

Find the smallest mole value: 1.3500506268985

Divide all components by the smallest value: C = 3.9962866444087, H=9.9943412269543, O = 1

Round to closest whole numbers: C = 4, H = 10, O = 1

Combine to get the empirical formula: C4H10O

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Which of the following polyatomic ions will form an ionic compound with a single sodium ion?

vaieri [72.5K]

Answer:

Option B, HCO3 1-

Explanation:

The valence of Sodium ion is +1 and the valence of HCO3 is -1. Thus, sodium ion has an extra electron to be donated to complete its outer shell while HCO3 needs an electron to complete its outer shell

Hence Na will combine with HCO3 to form NaHCO3

Option B is correct

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3 years ago

Ethanol and water appear the saame to the naked eye at 25C. Which properties can help a chemist distinguish between? denisty, ma

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Explanation:

As it is known that there are two types of properties. These are extensive and intensive.

Extensive properties : Properties that depend on the size or amount of system. For example, mass, volume etc.

Intensive properties : Properties that do not depend on the size or amount of system. For example, density, melting point, specific heat capacity etc.

On the basis of these properties water and ethanol are distinguished as follows.

Density of water is 997 kg/ $m^{3}$ whereas density of ethanol is 789 kg/ $m^{3}$ . Both these liquids can be separated by intensive properties.
Melting point of water is zero degree celsius whereas melting point of ethanol is -114.1 degree celsius.
Specific heat capacity of water is 4.184 $J/g ^{o}C$ whereas specific heat capacity of ethanol is 2.46 $J/g ^{o}C$ .
Mass of the given liquids cannot be differentiated because they will keep on changing depending on the quantity required. As mass is an extensive property, therefore, it is difficult to differentiate between the two liquids.

Thus, we can conclude that properties like density, melting point, specific heat capacity can help a chemist distinguish between ethanol and water.

7 0

3 years ago

In each case, calculate the appropriate ratio to show that the information given is consistent with the law of multiple proporti

Alchen [17]

Answer:

(a) 3:2; (b) 2:1

Explanation:

The Law of Multiple Proportions states that when two elements A and B combine to form two or more compounds, the masses of B that combine with a given mass of A are in the ratios of small whole numbers.

That is, if one compound has a ratio r₁ and the other has a ratio r₂, the ratio of the ratios r is in small whole numbers.

(a) Ammonia and hydrazine.

In ammonia, the mass ratio of H:N is r₁ = 0.2158/1

In hydrazine, the mass ratio of H:N is r₂ = 0.1439/1

The ratio of the ratios is:

$r = \dfrac{r_{1}}{r_{2}} = \dfrac{ 0.2158}{0.1439} = \dfrac{1.500 }{1} = \dfrac{2.999}{2} \approx \mathbf{\dfrac{3}{2}}\\\\\text{The relative amounts of H in the two compounds are in the ratio }\boxed{\mathbf{\dfrac{3}{2}}}$

(b) Nitrogen oxides

In nitrogen monoxide, the mass ratio of O:N is r₁ = 1.142/1

In dinitrogen monoxide, the mass ratio of O:N is r₂ = 0.571/1

The ratio of the ratios is:

$r = \dfrac{r_{1}}{r_{2}} = \dfrac{ 1.142}{0.571} = \dfrac{2.000 }{1} \approx \mathbf{\dfrac{2}{1}}\\\\\text{The relative amounts of O in the two compounds are in the ratio }\boxed{\mathbf{\dfrac{2}{1}}}$