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3 years ago

What are two elements that form a large number of bonds and that both have similar properties to carbon?

1 answer:

3 0

Silicon and Germanium. You can conclude it from its position in the periodic table. Silicon and Germanium are in the same group of the Carbon. That implies that all three have the same number of electrons in the outer orbital, which is responsible for the bonds.

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Enthalpy of combustion of ethyl alcohol, C2 H5 OH, is – 950 kJ mol–1. How much heat is evolved when one gram of ethyl alcohol bu

melomori [17]

<h3>Answer:</h3>

20.62 Kilo-joules

<h3>Explanation:</h3>

The Enthalpy of combustion of ethyl alcohol is -950 kJ/mol.
This means that 1 mole of ethyl alcohol evolves a quantity of heat of 950 Joules when burned.

Molar mass of ethyl ethanol = 46.08 g/mol

Therefore;

46.08 g of C₂H₅OH evolves heat equivalent to 950 kilojoules

We can calculate the amount of heat evolved by 1 g of C₂H₅OH

Heat evolved by 1 g of C₂H₅OH = Molar enthalpy of combustion ÷ Molar mass

= 950 kJ/mol ÷ 46.08 g/mol

= 20.62 Kj/g

Therefore, a gram of C₂H₅OH will evolve 20.62 kilo-joules of heat

7 0

2 years ago

The following reaction occurs in aqueous solution: NH4 + (aq) + NO2 - â†’ N2 (g) + 2H2O (l) The data below is obtained at 25Â°C.

GREYUIT [131]

Answer: The order with respect to $NH_4^+$ is 1.

Explanation:

Rate law says that rate of a reaction is directly proportional to the concentration of the reactants each raised to a stoichiometric coefficient determined experimentally called as order.

$NH_4^++NO_2^-\rightarrow N_2+2H_2O$

$Rate=k[NH_4^+]^x[NO_2^-]^y$

k= rate constant

x = order with respect to $NH_4^+$

y = order with respect to A $NO_2^-$

n = x+y = Total order

From trial 1: $3.2\times 10^{-3}=k[0.0100]^x[0.200]^y$ (1)

From trial 2: $6.4\times 10^{-3}=k[0.0200]^x[0.200]^y$ (2)

Dividing 2 by 1 : $\frac{6.4\times 10^{-3}}{3.2\times 10^{-3}}=\frac{k[0.0100]^x[0.2000]^y}{k[0.0200]^x[0.200]^y}$

$2=2^x,2^1=2^x$ therefore x= 1

Thus order with respect to $NH_4^+$ is 1.

8 0

2 years ago

How does the process of waste removal in a unicellular organism compare to the waste removal in a multicellular organism

Sonja [21]

The digestive system of multicellular is made up of several organs that work together to break down food so that it may be used in the body. Unicellular organisms have organelles, similar to organs, which help to digest food that will be used by the cell

6 0

3 years ago

Why is biodiversity important?

VARVARA [1.3K]

A or the first answer

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2 years ago

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Explain how natural resources are identified and why natural recourses are in evenly distributed.

mixer [17]

Answer:

Natural resources are not evenly distributed all over the world. Some places are more endowed that others — for instance, some regions have lots of water (and access to ocean and seas). Others have lots of minerals and forestlands. Others have metallic rocks, wildlife, fossil fuels and so on.

Explanation:

3 0

3 years ago