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Flauer [41]
2 years ago
5

How many grams are in 1.946 moles of NaCl

Chemistry
2 answers:
Elden [556K]2 years ago
5 0

113.8g

................

vodomira [7]2 years ago
3 0
Mass= mole x mr
Mass= 1.946 x (23+35.5)
Therefore, mass=113.841g
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Solid lead acetate is slowly added to 75.0 mL of a 0.0492 M sodium sulfate solution. What is the concentration of lead ion requi
Firdavs [7]

Answer:

The concentration of lead ion required to just initiate precipitation is -2.37\times10^-^5 M

Explanation:

Lets calculate -:

Solubility equilibrium -: PbI_2(s) ⇄ Pb^2^+ (aq) + 2I^- (aq)

Solubility product of PbI_2 ,Q=[Pb^2^+]_i_n_i_t_i_a_l [I^-]^2_i_n_i_t_i_a_l =9.8\times10^-^9

Concentration of I^-=[KI]=0.0492M

When the ionic product exceeds the solubility product , precipitation of salt takes place .

                                   Q_s_p\geq K_s_p

        [Pb^2^+]_i_n_i_t_i_a_l [I^-]^2_i_n_i_t_i_a_l \geq 9.8\times10^-^9

      [Pb^2^+]_i_n_i_t_i_a_l  [0.0492]^2 \geq 9.8\times10^-^9

                       [Pb^2^+]_i_n_i_t_i_a_l \geq \frac{9.8\times10^-^9}{[0.0492]^2}

                        [Pb^2^+]_i_n_i_t_i_a_l \geq \frac{9.8\times10^-^9}{2.42\times10^-^3}

                        [Pb^2^+]_i_n_i_t_i_a_l \geq 2.37\times10^-^5 M

Thus , PbI_2 will start precipitating when [Pb^2^+]_i_n_i_t_i_a_l   \geq 2.37\times10^-^5 M.    

3 0
3 years ago
500 grams of an unknown substance gains 23000 J of heat as it is heated from a temperature of 250C to 1250C. Using mathematical
lutik1710 [3]

Answer:

The given substance is cast iron.

Explanation:

Given data:

Mass of substance = 50 g

Heat absorbed = 23000 J

Initial temperature = 250°C

Final temperature = 1250°C

Which metal is this = ?

Solution:

Specific heat capacity:

It is the amount of heat required to raise the temperature of one gram of substance by one degree.

Formula:

Q = m.c. ΔT

Q = amount of heat absorbed or released

m = mass of given substance

c = specific heat capacity of substance

ΔT = change in temperature

ΔT = 1250°C -  250°C

ΔT = 1000°C

23000 j = 50 g ×c ×1000 °C

23000 J = 50,000 g. °C×c

c = 23000 J /50,000 g. °C

c = 0.46 J/g.°C

The given substance is cast iron.

4 0
3 years ago
What causes an electric current in a wire?
Romashka [77]

flow of charge of electrons cause current in wire.

6 0
3 years ago
Why is the atomic radius of iodine greater than the atomic radius of fluorine?
Artist 52 [7]

Answer:

Iodine has more electron levels (rings) than fluorine.

Explanation:

On the periodic table,  fluorine is on period 2 so it has 2 outer rings, iodine is on period 5 so it has 5 outer rings. The more rings the higher radius.

7 0
3 years ago
Which receptors are responsible for the production of saliva ?
Tcecarenko [31]
Its the taste receptors 
8 0
3 years ago
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