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2 years ago

What is the name of the compound PbS2 • 4H2O?

Chemistry

1 answer:

Ainat [17]2 years ago

6 0

Should be :

Lead Sulfate Tetrahydrate

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Find the mass of a 60 ML volume of water if the density of water is 1 g/mL

valkas [14]

Answer: 60 grams

Explanation: (60 ml)*(1g/ml) = 60g

3 0

2 years ago

What is an atomic number

rusak2 [61]

An atomic number is the number of protons that the atom of a particular element has.

For example, take carbon. Carbon has 6 protons. It's atomic number is 6.

5 0

3 years ago

The caloric content of 0.50 cup of cottage cheese is 1.10 x 102 kcal. This is the amount of energy released when 0.50 cup of cot

V125BC [204]

Answer:

A piece of unknown solid substance weighs 437.2 g, and requires 8460 J to increase its temperature from 19.3 °C to 68.9 °C.

What is the specific heat of the substance?

If it is one of the substances found in Table 8.1.1, what is its likely identity?

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2 years ago

A breakfast of cereal, orange juice, and milk might contain 230 nutritional Calories. How much is this in Joules?

Sophie [7]

Answer:

Explanation:

962,320 J

230 nutritional Calories in Joules is 962,320 J

4 0

1 year ago

Determine the equilibrium constant, Keq, at 25°C for the reaction

adelina 88 [10]

Explanation:

The given chemical reaction is:

$2Br^- (aq) + I_2(s) Br_2(l) + 2I^- (aq)$

$E^ocell=oxidation potential of anode + reduction potential of cathode\\$

The relation between Eo cell and Keq is shown below:

$deltaG=-RTlnK_e_q\\delta=-nFE^o cell\\=>nFE^o cell=RTlnK_e_q\\lnK_e_q=\frac{nF}{RT} E^o cell$

The value of Eo cell is:

Br- undergoes oxidation and I2 undergoes reduction.

Reduction takes place at cathode.

Oxidation takes place at anode.

Hence,

$E^ocell= (-1.07+0.53)V\\=-0.54V$

F=96485 C/mol

n=2 mol

R=8.314 J.K-1.mol-1

T=298K

Substitute all these values in the above formula:

$ln K_e_q=\frac{2mol* 96485 C/mol}{8.314 J.K^-^1.mol^-^1x298K} \\\\lnK_e_q=77.8\\K_e_q=e^7^7^.^8\\=>K_e_q=6.13x10^3^3$

Answer:

Keq=6.13x10^33

3 0

2 years ago