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3 years ago

10

Hi what is 100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000

00000000000000 times 2
ill be your friend

1 answer:

kogti [31]3 years ago

5 0

Answer:

2e+130

Explanation:

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A chemist prepares a solution by adding 258 mg of K2Cr2O7 (MW = 294.19 g/mol ) to a volumetric flask, and then adding water unti

Maksim231197 [3]

Answer: Molarity of the prepared solution is $1.75\times 10^{-3}mole/L$

Explanation:

Molarity is defined as the number of moles of solute dissolved per liter of the solution.

$Molarity=\frac{n\times 1000}{V_s}$

where,

n= moles of solute

$V_s$ = volume of solution in ml = 500 ml

moles of solute = $\frac{\text {given mass}}{\text {molar mass}}=\frac{0.258g}{294.19g/mol}=8.77\times 10^{-4}mol$

Now put all the given values in the formula of molarity, we get

$Molarity=\frac{8.77\times 10^{-4}moles\times 1000}{500ml}=1.75\times 10^{-3}mole/L$

Thus molarity of the prepared solution is $1.75\times 10^{-3}mole/L$

3 0

3 years ago

If a patient requires 30g/day of some medication and it comes in 500 mg tablets , how many tablets does this patient need in one

Anna11 [10]

Since 1000 mg=1g
500mg=?
500/1000*1g=0.5g
Since we know that 500mg is 0.5g then divide 30g by 0.5g
30/0.5=60
Therefore the patients needs to take 60 tablets a day.

4 0

4 years ago

Discuss availability of the lone pair of electrons to electrophile in dative bonding

Free_Kalibri [48]

Answer:

Explanation:

Here, a balance between attraction between nucleus and electrons, and electron-electron, and nuclei-nuclei repulsion play role.

All chemical bonds are formed by overlapping of orbitals. If the electronegativity of the two elements forming the bond is very different (elements from the 1st ,2nd groups with elements of 7th group) then ionic bond are formed. If the electronegativities are more similar, then overlapping is stronger, and covalent bonds are formed.

5 0

3 years ago

A. List 3 signs that a chemical reaction occurred.

ioda

A. gas change, color change, and temperature change.

B. color change; one day you wore a ring that wasn't stainless steel in the shower, so the following morning it was rusted.

6 0

3 years ago

At which temperature would a reaction with H -92 kJ/mol, S -0.199 kJ/(mol-K) be spontaneous? A.600k B.500k C.400k D.700k

stiv31 [10]

Given information : H = -92 KJ/mol and S = -0.199 KJ/(mol.K)

At equilibrium G = 0

We have to find the Temperature at which reaction would be spontaneous.

For spontaneous reaction : $\triangle G = negative (-)$

For non-spontaneous reaction : $\triangle G = positive (+)$

We can find the temperature using the formula for Gibbs free energy which is:

$\triangle G = \bigtriangleup H - T\bigtriangleup S$

Where, G = Gibbs free energy ,

H = Enthalpy

S = Entropy

T = Temperature

By plugging the value of G , H and S in the above formula we can find 'T'

$\triangle G = \bigtriangleup H - T\bigtriangleup S$

Since reaction should be spontaneous that means $\triangle G$ should be negative , so the above formula can be written as :

$\triangle G < \bigtriangleup H - T\bigtriangleup S$

On rearranging the above formula we get :

$0 < \bigtriangleup H - T\bigtriangleup S$

$T < \frac{\bigtriangleup H}{\bigtriangleup S}$

$T < \frac{-92\frac{KJ}{mol}}{-0.199\frac{KJ}{mol.K}}$

$T < (\frac{-92}{-0.199})\times (\frac{KJ}{mol})\times (\frac{mol.K}{KJ})$

$T < 462.3 K$

For the reaction to be spontaneous , T should be less than 462.3 K, so out of given option , C is correct which is 400 K.

8 0

3 years ago

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