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4 years ago

Why is there day and night

1 answer:

6 0

Because the moon orbits the earth and when the moon gets in front of the sun it blocks the sunlight and then it becomes night

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Working on-board a research vessel somewhere at sea, you have (carefully) isolated 12.5 micrograms (12.5 ×10–6 g) of what you ho

german

Answer:

The value is $Z = 311.33 \ g/mol$

Explanation:

From the question we are told that

The mass of saxitoxin is $m = 12.5 mg = 12.5 * 10^{-6} g$

The volume of water is $V = 3.10 mL = 3.10 *10^{-3} L$

The osmotic pressure is $P = 0.236 = \frac{0.236}{760} = 3.105 * 10^{-4} atm$

The temperature is $T = 19^oC = 19 + 273 = 292 \ K$

Generally the osmotic pressure is mathematically represented as

$P = C * T * R$

Here R is the gas constant with value

$R = 0.0821 ( L .atm /mol. K)$

and C is the concentration of saxitoxin

$3.105 * 10^{-4} = C * 0.0821 * 292$

$C = 1.295 *10^{-5} mol/L$

Generally the number of moles of saxitoxin is mathematically represented as

$n = C * V$

=> $n = 1.295 *10^{-5} *3.10 *10^{-3}$

=> $n = 4.015 *10^{-8} \ mol$

Generally the molar mass of saxitoxin is mathematically represented as

$Z = \frac{m}{n}$

=> $Z = \frac{12.5 * 10^{-6}}{ 4.015 *10^{-8}}$

=> $Z = 311.33 \ g/mol$

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4 years ago

For molecules with similar molecular weights, the dispersion forces become stronger as the molecules become more polarizable. fo

sweet [91]

True ncifjfjedkxkcnnfenskxkcjcndnenejskkxcfenen

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3 years ago

Pleeeeeeeeeeeeeeeeeeas help

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Answer:

For young organic materials, the carbon-14 (radiocarbon) method is used. The effective dating range of the carbon-14 method is between 100 and 50,000 years.

Explanation:

The answer is the explanation.

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2 years ago

Emerald-green crystals of the substance are used in nickel plating. what is the chemical name of this compound

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The answer is nickel sulfate hexahydrate.

The chemical name of the substance is nickel sulfate hexahydrate.

Emerald-green crystals of the substance are used in nickel plating. The chemical name of this compound nickel sulfate hexahydrate.

This substance is used in nickel panting and it is having chemical name that is nickel sulfate hexahydrate.

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3 years ago

At room temperature, table salt is a solid and mercury is a liquid. What conclusion can you draw about the melting points of the

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That salt has a higher melting point than mercury.

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3 years ago

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