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3 years ago

Percent concentration is one of the most common and basic concentration measurement used by general public. true or false?

Chemistry

1 answer:

Aleksandr [31]3 years ago

5 0

Answer:

TRUE: Percent concentration is one of the most common and basic concentration measurement used by general public

Explanation:

In chemistry there are many concentration measurements used to describe the mixtures. Some of them are, percent, molarity, molality, and molar fraction, among others.

Percent concentration is a popular one because it is commonly understood and used by the non specialist people, i.e. general public.

The percent concentration of a component is defined as: (amount of component in the mixture / amount of mixture) × 100.

The amounts may be measured in mass units (e.g grams) or volume units (e.g. mililiters).

For solutions, mass percent concentration is:

% = (mass of solute / mass of solution) × 100.

And voluem percen contration is:

% = (volume of solute / volume of solution) × 100

Since percentage is used in many profesional and personal activities, most persons use it.

For example, rubbing alcohol, that everyone buys in pharmacies, is 70%; vinager, used in the food, is acetic acid at 5% - 8%.

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The strongest energy waves that the Sun emits are _____. gamma rays ultraviolet rays microwaves infrared rays

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Gamma rays

gamma rays has shortest wavelength which emits from the sun so it has highest energy because energy and wavelength are inversely proportional to each other.

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2H2+O2-->2H2O, If you have 9 moles of Hydrogen gas (H2), how many moles of water can you form? (Enter just the number: not th

Naddika [18.5K]

If you have 9 moles of hydrogen gas(H2) the moles of water that can be formed is 9 moles

calculation

2H2 +O2→ 2H2O

The mole of H2O is calculated using the mole ratio.

that is H2:H2O is 2:2 into simple form = 1:1

therefore if 9 moles of H2 reacted the moles of H2O = 9 x1/1 = 9 moles

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3 years ago

Li₃N + 3 NH₄NO₃ 3 LiNO₃ + (NH₄)₃N

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Double reaction is the answer

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3 years ago

How many moles of sf6 are there in 459500000000000000 molecules of sf6

Vlada [557]

Answer : The number of moles of $SF_6$ is, $7.63\times 10^{-7}$ moles.

Solution :

As we know that,

1 mole contains $6.022\times 10^{23}$ number of molecules

As, $6.022\times 10^{23}$ number of molecules of $SF_6$ are present in 1 mole of $SF_6$

So, $4595\times 10^{14}$ number of molecules of $SF_6$ are present in $\frac{4595\times 10^{14}}{6.022\times 10^{23}}=7.63\times 10^{-7}$ moles of $SF_6$

Therefore, the number of moles of $SF_6$ is, $7.63\times 10^{-7}$ moles.

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3 years ago

Which equation represents a change that results in an increase in disorder?(1 ) I2(s)=>I2(g)

ankoles [38]

Answer : The correct option is, (1) $I_2(s)\rightarrow I_2(g)$

Explanation :

Entropy : It measures the disorderedness or randomness of the molecule.

That means higher the disorderedness, higher will be the entropy.

As we are going from solid state to liquid state, liquid state to gaseous state, the disorderedness increases due to the less inter-molecular interaction between the molecules.

And, as we are going from gaseous state to liquid state, liquid state to solid state, the disorderedness decreases due to the more inter-molecular interaction between the molecules.

(1) $I_2(s)\rightarrow I_2(g)$

In this reaction, the disorderedness increases because the state changes from solid to liquid.

(2) $CO_2(g)\rightarrow CO_2(s)$

In this reaction, the disorderedness decreases because the state changes from gaseous to solid.

(3) $2Na(s)+Cl_2(g)\rightarrow 2NaCl(s)$

In this reaction, the disorderedness decreases because the state changes from gaseous to solid.

(4) $2H_2(g)+O_2(g)\rightarrow 2H_2O(l)$

In this reaction, the disorderedness decreases because the state changes from gaseous to liquid.

Hence, the correct option is, (1) $I_2(s)\rightarrow I_2(g)$

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3 years ago

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