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Lunna [17]
2 years ago
11

What is mole in chemistry?

Chemistry
1 answer:
Zigmanuir [339]2 years ago
6 0

Answer:

the animal

Explanation:

a rodent thas in the ground

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A tetraphenyl phosphonium chloride (TPPCl) powder (FW=342.39) is 94.0 percent pure. How many grams are needed to prepare 0.45 L
slega [8]

Answer:

5.41 g

Explanation:

Considering:

Molarity=\frac{Moles\ of\ solute}{Volume\ of\ the\ solution}

Or,

Moles =Molarity \times {Volume\ of\ the\ solution}

Given :

For tetraphenyl phosphonium chloride :

Molarity = 33.0 mM = 0.033 M (As, 1 mM = 0.001 M)

Volume = 0.45 L

Thus, moles of tetraphenyl phosphonium chloride :

Moles=0.033 \times {0.45}\ moles

Moles of TPPCl = 0.01485 moles

Molar mass of TPPCl = 342.39 g/mol

The formula for the calculation of moles is shown below:

moles = \frac{Mass\ taken}{Molar\ mass}

Thus,

0.01485\ g= \frac{Mass}{342.39\ g/mol}

Mass of TPPCl = 5.0845 g

Also,

TPPCl is 94.0 % pure.

It means that 94.0 g is present in 100 g of powder

5.0845 g is present in 5.41 g of the powder.

<u>Answer -  5.41 g</u>

5 0
3 years ago
Please help ASAP! I’m lost right now.
SCORPION-xisa [38]
1s^2, 2s^2, 2p^6, 3s^2, 3p^6, 3d^5, 4s^1

Chromium is strange because it moves on to the 4s orbital instead of filling the 3d orbital with that last electron. Tricky.

Mark as brainliest if this helped! :)
3 0
3 years ago
The balanced equation for the generation of sugar from sunlight water and co2 is
asambeis [7]

The balanced equation for the generation of sugar from sunlight water and CO₂ is

6 CO₂ + 6 H₂O → C₆H₁₂O₆ + 6 O₂

carbon dioxide + water → sugar + oxygen

<span>The process of photosynthesis occurs when the chlorophyll present in the leaves of plants absorb sunlight to make food in the presence of carbon dioxide (enters through the stomata of leaves) and water (absorbed from the roots). As a result of this reaction sugar and oxygen is formed. After that sugar is converted in to starch and oxygen is released into air.</span>

8 0
3 years ago
Knowing what you know about the nucleus and the subatomic particles in the nucleus, what do you think is the charge of the nucle
iragen [17]
What I think is the charge of nucleus is the proton+neutron
4 0
3 years ago
Read 2 more answers
Which of the following processes have a ?S &gt; 0?
Ne4ueva [31]

Answer: Cesium chloride dissolves in pure water has \Delta S > 0.

Explanation:

Entropy is the measure of randomness or disorder of a system. If a system moves from  an ordered arrangement to a disordered arrangement, the entropy is said to decrease and vice versa.

\Delta S is positive when randomness increases and \Delta S is negative when randomness decreases.

a) 2HCl(g)\rightarrow H_2(g)+Cl_2(l)

As 2 moles of gas are converting to 1 mole of gas and 1 mole of liquid, the randomness decreases and hence \Delta S is negative.

b) 2NH_3(g)+CO_2(g)\rightarrow NH_2CONH_2(aq)+H_2O(l)

As gas molecules are converting into aqueous and liquid form,  the randomness decreases and hence \Delta S is negative.

c) lithium fluoride forms from its elements: 2Li+F_2\rightarrow 2LiF

As elements are combining to form a compound, the randomness decreases and hence \Delta S is negative.

d) Cesium chloride dissolves in pure water : CaCl_2(s)\rightarrow Ca^{2+}(aq)+2Cl^-(aq)

As compound is dissociating into ions, the randomness increases and hence \Delta S is positive.

3 0
3 years ago
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