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2 years ago

What is the freezing point of a 0.321m aqueous solution of nacl?

1 answer:

6 0

A solution exhibits colligative properties since solute interferes with the interaction of the atoms which would change certain properties of the solution. In this case, it is the freezing point that is affected. We calculate as follows:

ΔT = kf (m) i
where kf is the freezing point depression constant which is 1.86 for water
m is molality
i is the van't hoff factor which is 2 for NaCl

ΔT = 1.86(0.321) 2
ΔT = 1.19412 °C
1.19412 °C = 0 - T
T = -1.19412 °C

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A certain element X has four isotopes. 4.350% of X has a mass of 49.94605 amu. 83.79% of X has a mass of 51.94051 amu. 9.500% of

sesenic [268]

Answer: The average atomic mass of the element X is 51.99592 amu

Explanation:

Mass of isotope 1 = 49.94605 amu

% abundance of isotope 1 = 4.350% = $\frac{4.350}{100}=0.0435$

Mass of isotope 2 = 51.94051 amu.

% abundance of isotope 2 = 83.79% = $\frac{83.79}{100}=0.8379$

Mass of isotope 3 = 52.94065 amu.

% abundance of isotope 2 = 9.500% = $\frac{9.500}{100}=0.095$

Mass of isotope 4 = 53.93888 amu.

% abundance of isotope 2 = 2.360% = $\frac{2.360}{100}=0.0236$

Formula used for average atomic mass of an element :

$\text{ Average atomic mass of an element}=\sum(\text{atomic mass of an isotopes}\times {{\text { fractional abundance}})$

$A=(49.94605\times 0.0435)+(51.94051 \times 0.8379)+ (52.94065\times 0.095)+(53.93888\times 0.0236)$

$A=51.99592amu$

Therefore, the average atomic mass of the element X is 51.99592 amu

5 0

2 years ago

In which orbital does an electron in a bromine atom experience the greatest effective nuclear charge?

asambeis [7]

First let us determine the electronic configuration of Bromine (Br). This is written as:

Br = [Ar] 3d10 4s2 4p5

Then we must recall that the greatest effective nuclear charge (also referred to as shielding) greatly increases as distance of the orbital to the nucleus also increases. So therefore the electron in the farthest shell will experience the greatest nuclear charge hence the answer is:

<span>4p orbital</span>

4 0

2 years ago

Read 2 more answers

4. How does the kinetic theory of gases explain the weather changes happening in the troposphere? You can also research on the I

uranmaximum [27]

According to the kmt pressure is directly proportional to the number of collision between particles

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2 years ago

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Determine whether the statement is true or false, and why? “Climate change could cause many habitats to be destroyed, leading to

77julia77 [94]

Answer:

False. It should read that both plant and animal species are in danger of extinction, and climate change can destroy habitats.

Explanation:

8 0

2 years ago

What is the maximum volume of a 0.788 M CaCl2 solution that can be prepared using 85.3 g CaCl2

LekaFEV [45]

Molar mass CaCl₂ = 111.0 g/mol

number of moles:

n = mass of solute / molar mass

n = 85.3 / 111.0

n = 0.7684 moles of CaCl₂

M = n / V

0.788 M = <span>0.7684 / V
</span>
V = 0.7684 / 0.788

V = 0.97512 L

hope this helps!

3 0

2 years ago