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3 years ago

Why do we use 51.0mL of NaOH but only 50.0mL of HCl?

Chemistry

1 answer:

bixtya [17]3 years ago

3 0

Answer

Na OH reacts with H Cl and forms Na Cl and H₂O

NaOH + HCl → NaCl + H₂O

Here we can see that 1 mole of NaOH reacting with 1 mole of HCl and forming 1 mole of NaCl and 1 mole of H₂O

when NaOH and HCl are added together in equal amount then they will completely neutralize each other but NaOH is hygroscopic in nature which means it can absorb water from air so it will not be weighted accurately.

hence, for neutralization we will take extra NaOH.

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3 years ago

At a certain temperature, the decomposition of NO2 is second order with a rate constant of 2.85 M-1min-1. If one starts with 1.7

alex41 [277]

Answer: It will take 0.50 minutes for it to decompose to 28.2% of its initial value

Explanation:

Integrated rate law for second order kinetics is given by:

$\frac{1}{a}=kt+\frac{1}{a_0}$

a= concentration left after time t = $\frac{28.2}{100}\times 1.77=0.50M$

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t= time taken for decomposition

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$t=0.50min$

Thus it will take 0.50 minutes for it to decompose to 28.2% of its initial value

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3 years ago

State whether the following statements are true or false (with justification). (a) 1 mol of N2 has more molecules than 1 mol of

MAVERICK [17]

Answer:

A. False.

Every substance contains the same number of molecules i.e 6.02x10^23 molecules

B. False.

Mass conc. = number mole x molar Mass

Mass conc. of 1mole of N2 = 1 x 28 = 28g

Mass conc. of 1mol of Ar = 1 x 40 = 40g

The mass of 1mole of Ar is greater than the mass of 1mole of N2

C. False.

Molar Mass of N2 = 2x14 = 28g/mol

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Explanation:

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3 years ago

GIVING BRAINLYY

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<h2>Hey There!</h2><h2>____________________________________</h2><h2>Answer:</h2>

$\huge\boxed{Option B}$

<h2>____________________________________</h2><h2><u>PERIODIC TABLE</u>:</h2>

The periodic table, arranges the chemical elements ascording to their recurring properties. The number of each element corresponds to the number of protons in its nucleus.

<h3>-------------------------------------------------------------------------------------------</h3><h3>Groups and Periods</h3>

There are 8 groups and 7 periods in the periodic table.

_________________________________________________________

Each element within a group has similar physical or chemical properties because of its atom's outermost electron shell. The outermost shell of every element in a specific group has same number of valence shell (most chemical properties are determined by the the outermost valence shell electron). The group number of an element represents the number of electrons in its outermost orbit. This shows that elements arranged in the same group have the same number of electrons in their outermost orbit.

<h2>_____________________________________</h2><h3>Sodium and Potassium</h3>

Sodium and Potassium belong to the same group i.e. GROUP 1 which is also called S BLOCK Group or IONIC GROUP. They have the similar properties,

__________________________________________________________

Properties of S block Elements

1- They are soft metals

2- possess low melting and boiling points

3- They have the largest atomic radii in their corresponding periods

4- are good conductors of heat and electricity.

5- They have low values of ionization energies and are hence highly electropositive.

<h2>_____________________________________</h2><h2>Best Regards,</h2><h2>'Borz'</h2><h2 />

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