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babunello [35]
3 years ago
10

The drinking water standard for nitrate is 10 mg/L as N (i.e., drinking waters should not exceed this value). What quantity of n

itrate ion does this concentration represent?
Chemistry
1 answer:
Juliette [100K]3 years ago
8 0

Answer:

This concentrations represents 9.71 x 10¹⁹  nitrate ions per litre of drinking water.

Explanation:

Nitrate: NO₃⁻

MW = 62.00 g/mol

1 mol = 6.022 x 10²³

62 g  NO₃⁻ ____________ 6.022 x 10²³ ions

10 x 10⁻³ g NO₃⁻ _________ x

x = 9.71 x 10¹⁹ ions

This concentrations represents 9.71 x 10¹⁹  nitrate ions per litre of drinking water.

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How many valence electrons should be used to draw a Lewis structure of methane CH4
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8 valence electrons

Explanation:

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In 1939, at the age of 20, a man stood 270 cm tall (over 8 1/2 feet) and wore size 37 shoes! The hormonal disorder from which he
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SCORPION-xisa [38]
Question #1
Potasium hydroxide (known)
 volume used is 25 ml 
Molarity (concentration) = 0.150 M
Moles of KOH used 
           0.150 × 25/1000 = 0.00375 moles
Sulfuric acid (H2SO4) 
volume used = 15.0 ml
unknown concentration
The equation for the reaction is
2KOH (aq)+ H2SO4(aq) = K2SO4(aq) + 2H2O(l) 
Thus, the Mole ratio of KOH to H2SO4 is 2:1
Therefore, moles of H2SO4 used will be;
      0.00375 × 1/2 = 0.001875 moles
Acid (sulfuric acid)  concentration
    0.001875 moles × 1000/15  
        = 0.125 M

Question #2
Hydrogen bromide (acid)
Volume used = 30 ml
Concentration is 0.250 M
Moles of HBr used;
      0.25 × 30/1000
        =  0.0075 moles 
Sodium Hydroxide (base)
Volume used 20 ml 
Concentration (unknown)
The equation for the reaction is 
NaOH + HBr = NaBr + H2O
The mole ratio of NaOH : HBr   is 1 : 1
Therefore, moles of NaOH used;
                 = 0.0075 moles
NaOH concentration will be 
       = 0.0075 moles × 1000/20
       = 0.375 M

7 0
3 years ago
In each of the following blanks, only enter a numerical value.
tatiyna

Answer:

1) 1,... 2

2) 18

3) n= 3 and I=1

Explanation:

1) when l= 0, its an s-sub-level, and only 1 orbital is possible which can carry only 2-electrons

2) the maximum number of electron is given by 2n^2= 2×3^2= 18

3) in 3p, the coefficient of p is the value of n= 3 and l-value of P is 1

5 0
2 years ago
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