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3 years ago

Convert 3.00 moles As2S3 to grams.

Chemistry

2 answers:

givi [52]3 years ago

7 0

738.1146 grams, your're welcome

Setler [38]3 years ago

4 0

Answer:

738 grams

Explanation:

As2S3 is called Arsenic Sulfide.

The formula needed here is

Number of moles (n) = m ÷ mm

where m = mass of the substance/compound

mm = molar mass of the same substance/compound

Here, the number of moles has been given to be 3 moles, we can determine the molar mass of the substance from the chemical formula given, hence our unknown is the mass of the compound .

Molar mass of Arsenic (As) is 75 g/mol while that of Sulfur is 32 g/mol.

Hence, the molar mass of the compound; As2S3 will be

(75 x 2) + (32 x 3) = 246 g/mol

From the formula given earlier, we can deduce that mass of As2S3 will be number of moles multiplied by molar mass of As2S3

m = n x mm

m = 3 x 246

m = 738 grams

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The expression of $K_c$ for above equation follows:

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Answer:

For a: The isotopic representation of iodine is $_{53}^{131}\textrm{I}$

For b: The isotopic representation of cesium is $_{55}^{137}\textrm{Cs}$

For c: The isotopic representation of strontium is $_{38}^{52}\textrm{Sr}$

Explanation:

The isotopic representation of an atom is: $_Z^A\textrm{X}$

where,

Z = Atomic number of the atom

A = Mass number of the atom

X = Symbol of the atom

For a:

We are given:

Number of neutrons = 78

Atomic number of iodine = 53 = Number of protons

Mass number = 53 + 78 = 131

Thus, the isotopic representation of iodine is $_{53}^{131}\textrm{I}$

For b:

We are given:

Number of neutrons = 82

Atomic number of cesium = 55 = Number of protons

Mass number = 55 + 82 = 137

Thus, the isotopic representation of cesium is $_{55}^{137}\textrm{Cs}$

For c:

We are given:

Number of neutrons = 52

Atomic number of strontium = 38 = Number of protons

Mass number = 38 + 52 = 90

Thus, the isotopic representation of strontium is $_{38}^{52}\textrm{Sr}$

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