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2 years ago

5. Common (most stable) mass numbers of the following elements are Al-27, Pt-195, Co-59,

Chemistry

1 answer:

ankoles [38]2 years ago

7 0

Answer:

Number of neutrons of Al²⁷₁₃ = 14

Number of neutrons of Pt¹⁹⁵₇₈= 117

Number of neutrons of Co⁵⁹₂₇= 32

Number of neutrons of Ag¹⁰⁸₄₇= 61

Number of neutrons of Au¹⁹⁷₇₉ = 118

Explanation:

We know that atomic number of an atom is number of electron or protons while atomic mass is sum o number of neutrons and and protons.

Shorthand notations of given elements:

Al²⁷₁₃

This notation shows that atomic number of Al-27 is 13 and atomic mass is 27.

Number of neutrons of Al²⁷₁₃ = 27 - 13

Number of neutrons of Al²⁷₁₃ = 14

Pt¹⁹⁵₇₈

This notation shows that atomic number of Pt-195 is 78 and atomic mass is 195.

Number of neutrons of Pt¹⁹⁵₇₈ = 195 - 78

Number of neutrons of Pt¹⁹⁵₇₈= 117

Co⁵⁹₂₇

This notation shows that atomic number of Co-59 is 27 and atomic mass is 59.

Number of neutrons of Co⁵⁹₂₇ = 59 - 27

Number of neutrons of Co⁵⁹₂₇= 32

Ag¹⁰⁸₄₇

This notation shows that atomic number of Ag-108 is 47 and atomic mass is 108.

Number of neutrons of Ag¹⁰⁸₄₇ = 108 - 47

Number of neutrons of Ag¹⁰⁸₄₇= 61

Au¹⁹⁷₇₉

This notation shows that atomic number of Au-197 is 79 and atomic mass is 197.

Number of neutrons of Au¹⁹⁷₇₉ = 197 - 79

Number of neutrons of Au¹⁹⁷₇₉ = 118

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However, it is worth nothing that, despite water being referred as universal solvent, many compounds are insoluble or partially soluble in water. For instance, most of the hydroxide displays poor solubility in water.

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How many moles of H atoms are in 15.2 grams of pure ice?

nikitadnepr [17]

The number of moles of H atoms in 15.2 grams of pure ice is 0.850 moles

The number of moles of O atoms in 15.2 grams of pure ice is 13.50 moles

An atom is a smallest indivisible particle of a chemical element that is capable of independent existence.

Pure ice contains the H2O molecules and the molar mass of H2O is 18.02 g/mol

Using the relation:

number of moles = mass/molar mass

The number of moles of H2O = 15.2 grams/18.02 g/mol

number of moles of H2O = 0.8435 moles

If the atomic mass of H and O are as follow:

the atomic mass of H atom is = 1.00784 g/mol
the atomic mass of O atom is = 15.999 g/mol

Then:

the number of H atoms in 15.2 grams of pure ice = mass of H atom × molar mass of H2O.

the number of H atoms = 0.8435 mol × 1.00784 g/mol

the number of H atoms = 0.850 moles

the number of O atoms in 15.2 grams of pure ice = 0.8435 mol × 15.999 g/mol

the number of O atoms = 13.50 moles

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2 years ago

Convert the following into balanced equations. ( Use the lowest possible coefficents)?(a) When gallium metal is heated in oxygen

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Answer:

Explanation:

(a) Balanced reaction of gallium with oxygen is as follows:

$4Ga(s)+3O_2(g) \rightarrow 2Ga_2O_3 (s)$

(b) $C_6H_{14}(l)+O_2(g)\rightarrow CO_2(g)+H_2O(l)$

Multiply the carbon dioxide by 6 to balance carbon as follows:

$C_6H_{14}(l)+O_2(g)\rightarrow 6CO_2(g)+H_2O(l)$

After that multiply H2O by 7 to balance hydrogen as follows:

$C_6H_{14}(l)+O_2(g)\rightarrow CO_2(g)+7H_2O(l)$

Finally balance oxygen by multiplying O2 by 19/2. Therefore, balanced reaction is as follows:

$C_6H_{14}(l)+\frac{19}{2} O_2(g)\rightarrow 6CO_2(g)+7H_2O(l)$

first balance calcium, by multiply $CaCl_2$ by 3 as follows:

$Na_3PO_4(s)+3CaCl_2 \rightarrow Ca_3(PO_4)_2+NaCl$

After that balance phosphorous by multiplying $Na_3PO_4$ by 2 as follows:

$2Na_3PO_4(s)+3CaCl_2 \rightarrow Ca_3(PO_4)_2+NaCl$

Finally balance Na by multiplying NaCl by 6. Therefore, balance reaction is as follows:

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