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ch4aika [34]
3 years ago
14

What is the molas mass of lithium oxide li2o

Chemistry
2 answers:
gladu [14]3 years ago
7 0
The molar mass of lithium oxide is 
29.88 g/mol
Alexxandr [17]3 years ago
6 0

Explanation:

Atomic mass means the sum of total number of protons and neutrons present in an element.

Molar mass is defined as the mass of one mole of a compound present in grams.  

For example, molar mass of Li_{2}O is as follows.

      Molar mass of Li_{2}O = 2 × atomic mass of Li + atomic mass of O

                                     = 2 \times 6.94 g/mol + 16.0 g/mol

                                     = 13.88 g/mol + 16.0 g/mol

                                      = 29.88 g/mol

Thus, we can conclude that molar mass of Li_{2}O is 29.88 g/mol.

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20 mL of an approximately 10% aqueous solution of ethylamine, CH3CH2NH2, is titrated with 0.3000 M aqueous HCl. Which indicator
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Answer:

Therefore, The indicator that is best fit for the given titration is Bromocresol Green Color change from pH between 4.0 to 5.6

Bromocresol green, color change from pH = 4.0 to  5.6

Explanation:

The equation for the reaction is :

C_2H_5NH_2_(_a_q_)     +     H^+_(_a_q_)   ---      C_2H_5NH_{3(aq)}^+

concentration of C_2H_5NH_{2(aq) = 10%

10 g of C_2H_5NH_{2(aq) in 100 ml solution

molar mass = 45.08 g/mol

number of moles = 10 / 45.08

= 0.222 mol

Molarity of C_2H_5NH_2(aq) = 0.222 \times \frac{1000}{100}mL

= 2.22 M

number of moles of C_2H_5NH_{2(aq) in 20 mL can be determined as:

= 20 mL \times  2.22 M= 44*10^{-3} mole

Concentration of C_2H_5NH_2(aq) = \frac{44*10^{-3}*1000}{20}

= 2.22 M

Similarly, The pKa Value of C_2H_5NH_{2(aq) is given as 10.75

pKb value will be: 14 - pKa

= 14 - 10.75

= 3.25

the pH value at equivalence point is,

pH= \frac{1}{2}pKa - \frac{1}{2}pKb-\frac{1}{2}log[C]

pH = \frac{14}{2}-\frac{3.25}{2}-\frac{1}{2}log [2.22]

pH = 5.21

Therefore, The indicator that is best fit for the given titration is Bromocresol Green Color change from pH between 4.0 to 5.6

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Answer:  1.0\times 10^2g

Explanation:

Depression in freezing point is given by:

\Delta T_f=i\times K_f\times m

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i= vant hoff factor = 1 (for non electrolyte like urea)

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m= molality

\Delta T_f=i\times K_f\times \frac{\text{mass of solute}}{\text{molar mass of solute}}\times \text{weight of solvent in kg}}

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Mass of non electrolyte (urea) added = ?

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x=1.0\times 10^2g

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8 0
3 years ago
What is the charge of the following polyatomic ions
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Answer:

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D

3 0
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The name given to the main group elements in group 2 is _______.
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Answer:

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