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Vladimir [108]
3 years ago
9

Help me please??????

Chemistry
2 answers:
snow_tiger [21]3 years ago
8 0

Answer:

a

Explanation:

Snezhnost [94]3 years ago
7 0

Answer:

It would be the first one

Explanation:

According the solubility rules if SO4 is with Pb then it is insoluble.

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Octane C8H18 is an ingredient in gasoline. How many carbon atoms are in 20 kg of octane? help please
eduard

Answer:

Octane is a hydrocarbon and an alkane with the chemical formula C 8 H 18, and the condensed structural formula CH 3 (CH 2) 6 CH 3.Octane has many structural isomers that differ by the amount and location of branching in the carbon chain. One of these isomers, 2,2,4-trimethylpentane (commonly called iso-octane) is used as one of the standard values in the octane rating scale.

Chemical formula: C₈H₁₈

Molar mass: 114.232 g·mol−1

Melting point: −57.1 to −56.6 °C; −70.9 to −69.8 °F; 216.0 to 216.6 K

Solubility in water: 0.007 mg dm−3 (at 20 °C)

3 0
3 years ago
Read 2 more answers
A gas occupies 5.31 liters at a pressure of 0.55 atm. Determine the volume at standard pressure.
yuradex [85]

Answer:

Option A; V =  2.92 L

Explanation:

If we assume a lot of things, like:

The gas is an ideal gas.

The temperature is constant.

The gas does not interchange mass with the environment.

Then we have the relation:

P*V = n*R*T = constant.

Where:

P = pressure

V = volume

n = number of moles

R = constant of the ideal gas

T = temperature.

We know that when P = 0.55 atm, the volume is 5.31 L

Then:

(0.55 atm)*(5.31 L) = constant

Now, when the gas is at standard pressure ( P = 1 atm)

We still have the relation:

P*V = constant = (0.55 atm)*(5.31 L)

(1 atm)*V = (0.55 atm)*(5.31 L)

Now we only need to solve this for V.

V = (0.55 atm/ 1 atm)*(5.31 L) = 2.92 L

V = 2.92 L

Then the correct option is A.

7 0
3 years ago
What is conductivity? How is it measured?
horrorfan [7]

Conductivity is a measurement of the ability of an aqueous solution to transfer an electrical current.

Explanation:

To calculate the conductivity of a solution you simply multiply the concentration of each ion in solution by its molar conductivity and charge then add these values for all ions in solution.

3 0
2 years ago
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An element or compound which occurs naturally in the earth is a ___?
Rzqust [24]
An element or compound which occurs naturally in the earth is a mineral
5 0
3 years ago
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Which of the following statements concerning the measured number 0.3030
Dennis_Churaev [7]

Answer:

C

Explanation:

If you move the decimal to the left it transforms the expression into scientific notation.

8 0
3 years ago
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