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3 years ago

Can someone explain #3

Chemistry

2 answers:

Kitty [74]3 years ago

7 0

Answer:

See below.

Explanation:

121.76 amu is the Relative Atomic Mass of Antimony (the average mass of the different isotopes). . The element exists as a mixture of isotopes , the main one being SB121 which has a mass of 121.

Snezhnost [94]3 years ago

3 0

Answer:

Explanation:

Hey,

so here the student is saying that the given mass is of one atom. But when we usually talk about amu it is the unified atomic mass so mass of all the atoms present.

So that's why he is wrong.

Also the definitions states,

The atomic mass of an element is the average mass of the atoms of an element measured in atomic mass unit (amu, also known as daltons, D). The atomic mass is a weighted average of all of the isotopes of that element, in which the mass of each isotope is multiplied by the abundance of that particular isotope.

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3 years ago

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Answer:

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Explanation:

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3 years ago

Which statement is true about the exothermic reaction?

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Answer:

Explanation:

The enthalpy of the reactants is greater than that of the products.

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2 years ago

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3 years ago

A government laboratory wants to determine whether water in a certain city has any traces of fluoride and whether the concentrat

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<u>Answer:</u> The given sample of water is not safe for drinking.

<u>Explanation:</u>

We are given:

Concentration of fluorine in water recommended = 4.00 ppm

ppm is the amount of solute (in milligrams) present in kilogram of a solvent. It is also known as parts-per million.

To calculate the ppm of fluorine in water, we use the equation:

$\text{ppm}=\frac{\text{Mass of solute}}{\text{Mass of solution}}\times 10^6$

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We are given:

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Putting values in above equation, we get:

$\text{ppm of fluorine in water}=\frac{0.152\times 10^{-3}}{5}\times 10^6\\\\\text{ppm of fluorine in water}=30.4$

As, the calculated concentration is greater than the recommended concentration. So, the given sample of water is not safe for drinking.

Hence, the given sample of water is not safe for drinking.

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3 years ago