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pychu [463]
3 years ago
7

What is the gram atomic mass of sodium?

Chemistry
2 answers:
Rom4ik [11]3 years ago
7 0
3.8175407 × 10^-23 g ± 3.3210778 × 10^-32 g
MatroZZZ [7]3 years ago
5 0
3.8175407 x 10^-23 g + 3.3210778 x 10^-32 g
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Calculate the electric double layer thickness of a alumina colloid in a dilute (0.1 mol/dm3) CsCI electrolyte solution at 30 °C.
Ad libitum [116K]

Explanation:

The given data is as follows.

    Concentration = 0.1 mol/dm^{3}

                             = 0.1 \frac{mol dm^{3}}{dm^{3}} \frac{10^{3}}{dm^{3}} \times \frac{6.022 \times 10^{23}}{1 mol} ions

                             = 6.022 \times 10^{25} ions/m^{3}

               T = 30^{o}C = (30 + 273) K = 303 K

Formula for electric double layer thickness (\lambda_{D}) is as follows.

            \lambda_{D} = \frac{1}{k} = \sqrt \frac{\varepsilon \varepsilon_{o} K_{g}T}{2 n^{o} z^{2} \varepsilon^{2}}

where, n^{o} = concentration = 6.022 \times 10^{25} ions/m^{3}

Hence, putting the given values into the above equation as follows.

                 \lambda_{D} = \sqrt \frac{\varepsilon \varepsilon_{o} K_{g}T}{2 n^{o} z^{2} \varepsilon^{2}}                    

                          = \sqrt \frac{78 \times 8.854 \times 10^{-12} c^{2}/Jm \times 1.38 \times 10^{-23}J/K \times 303 K}{2 \times 6.022 \times 10^{25} ions/m^{3} \times (1)^{2} \times (1.6 \times 10^{-19}C)^{2}}  

                         = 9.669 \times 10^{-10} m

or,                     = 9.7 A^{o}

                          = 1 nm (approx)

Also, it is known that \lambda_{D} = \sqrt \frac{1}{n^{o}}

Hence, we can conclude that addition of 0.1 mol/dm^{3} of KCl in 0.1 mol/dm^{3} of NaBr "\lambda_{D}" will decrease but not significantly.

7 0
3 years ago
Which of the following is transferred due to a temperature difference?
quester [9]
Water can be turned to ice if to cold gas if to hot 
ice can turn to water if to hot and stay the same if to cold 
gas will turn to water if to hot and freeze to ice if to cold and the pattern keeps going like that.
hope this helps 
 
8 0
3 years ago
Scientists use models to
telo118 [61]
B- Predict the damages due to an earthquake
4 0
2 years ago
CH3COOH + ...... -> (CH3COO)2Ba + H2O
julia-pushkina [17]

Answer:

CH3COOH Ba OH 2 Ba CH3COO 2 H2O?

Explanation:

hope it helps you ~♥~

5 0
2 years ago
. The periodic table is based on an element's
mario62 [17]
The periodic table is based on an elemnt's (A) atomic number you can see this with Tellurium and Iodine.
Hope this helps :).
7 0
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