5. calculate the molarity of a solution made from dissolving 80.og of lithium
chloride (licl) in 800.oml of solution.

Explanation:

1. Data:

a) M = ?

b) m = 80.0 g Li Cl

c) V = 800 ml solution

2. Principles and formulae:

Molarity is the unit of concentration that expresses moles of solute per liter of solution:

The number of moles, n, of a compound may be calcualted from its molar mass:

3. Solution:

i) Molar mass of LiCl = 42.394 g/mol

ii) Number of moles of solute, LiCl = 80.0 g / 42.394 g/mol = 1.887 mol

iii) Volume of solution = 800.0 ml × 1 liter / 1,000 ml = 0.8000 liter

iv) M = 1.887 mol / 0.8000 liter = 2.36 M ← answer

answer:

payment just for service  

→

$

87.12

payment for service including tax

→

$

94.09

explanation:

service only with 20% tip  

→

$

72.6

(

1

+

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100

)

=

$

87.12

in the opening of the question the word 'service' is associated only with the pretax value.

the closing part of the question asks: how much did she pay for the  

service

−−−−−−  

so technically the answer is  

→

$

72.6

(

1

+

20

100

)

=

$

87.12

however, the intention of the question provider may have been that your answer is to be  

$

87.12

(

1

+

8

100

)

=

$

94.09

to 2 decimal places.

'

payment just for service  

→

$

87.12

payment for service including tax

→

$

94.09

tony b

mar 21, 2017

answer:

trying to explain it another way

explanation:

service charge  

.

→

$

72.60

20% tip  

20

100

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14.52

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add

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8

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6.97

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