2H2 + O2 mc002-1.jpg 2H2O The number of moles of hydrogen that is needed to produce 0.253 mol of water is

Answers

Answer 1
Answer:

Answer : The number of moles of hydrogen gas needed are, 0.253 mole

Explanation : Given,

Moles of water = 0.253 mole

Now we have to calculate the moles of hydrogen gas.

The given balanced chemical reaction is,

2H_2+O_2\rightarrow 2H_2O

From the balanced reaction we conclude that,

As, 2 moles of water obtained from 2 moles of hydrogen gas

So, 0.253 moles of water obtained from (2)/(2)* 0.253=0.253mole of hydrogen gas

Therefore, the number of moles of hydrogen gas needed are, 0.253 mole

Answer 2
Answer: Mol --> Mol is a one step, XMol H2 = .253mol H20 x 2/2 = .253 mol H2

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A concentrated solution contains a large proportion of solute relative to the solvent. true or false

Answers

The statement “Aconcentrated solution contains a large proportion of solute relative to thesolvent.” is true. It means that the amount of solute molecules present in thatsolution is greater than the amount of solvent molecules present in thatsolution.

If you are performing a stoichiometry problem and the only information you have to start is the molarity and volume of a solution used, what would you do?

Answers

Answer:

If you are performing a stoichiometry problem and the only information you have to start is the molarity and volume of a solution used, then one would multiply the molarity and volume to find moles.

Explanation:

In a stoichiometry problem, we multiply the molarity and volume to find moles,  balance the chemical equation, find the mole ratio, calculate the moles of either the product formed or the reactant consumed in the reaction, and if required convert moles to grams.

 It might be the best answer: multiply the molarity by the volume (in liters) to find moles

Which element in the alkali group will have the lowest first ionization energy?

Answers

Fluorine

Explanation:

F- has the lowest ionisation energy

The difference between the transmissivity of shortwave insolation and longwave terrestrial radiation by various atmospheric gases is better known as the _________________.

Answers

Answer:

greenhouse effect

Explanation:

Greenhouse effect -

It is the process by which the radiations on the planet gets trapped inside its atmosphere and increases the temperature of the planet , is referred to as the process of greenhouse effect .

Few gases are responsible to show this process , like carbon dioxide . methane , water vapour etc.

The process of greenhouse is important for the planet to sustain life , as it makes the planet warm and thereby don't allow the planet to freeze ,

But  excess of greenhouse effect can make the planet extremely warm , and lead to a condition of global warming .

Hence , from the given information of the question ,

The correct answer is greenhouse effect .

Why does the addition of acid increase the solubility of calcium phosphate?

Answers

An addition of acid increases the solubility of calcium phosphate because the hydrogen ions can easily dissociate and form salts. And example is from the reaction 3H2SO4 + Ca3(PO4)2 → 2H3PO4 + 3CaSO4. CaSO4 is the salt of sulfuric acid and calcium phosphate. 

A nuclear family consists of

Answers

A biological mother, A biological father and a child

Final answer:

A nuclear family consists of two parents and their children, living together without any other relatives. It is seen as the core unit of a family structure.

Explanation:

A nuclear family, also referred to as an elementary family, is a family group that typically consists of two parents and their children. It is considered the smallest family unit and is widely seen across different cultures and societies. This family structure is contrasted with extended family, which includes other relatives like grandparents, aunts, uncles, and cousins.

For example, if there's a mother, father, and two children in a household, with no other relatives living with them, that is a nuclear family. The term 'nuclear' is used to denote that this unit is the core, central part of the family from which other members branch out.

Learn more about Nuclear Family here:

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