Question

Question #1 How many electrons are there in 1 g of carbon $_6^{12}C$, oxygen $_8^{16}O$, silicon $_{14}^{28}Si$, sulfur $_{16}^{34}S$, and calcium $_{20}^{40}Ca$? Question #2 If K40 has a half-life of $1.4 \times 10^9$ years and only 10% of the original K40 remains, how old is the earth? QUESTION #3 The nucleus of platinum ($_{78}^{192}Pt$) decays to osmium ($_{76}^{188}Os$). The atomic masses of Pt-192 and Os-188 are 191.9614 and 187.9560 amu, respectively. How much energy is released in this reaction?

          Question #1
How many electrons are there in 1 g of carbon $_6^{12}C$, oxygen $_8^{16}O$, silicon $_{14}^{28}Si$, sulfur $_{16}^{34}S$, and calcium $_{20}^{40}Ca$? 
Question #2
If K40 has a half-life of $1.4 \times 10^9$ years and only 10% of the
original K40 remains, how old is the earth?
QUESTION #3
The nucleus of platinum ($_{78}^{192}Pt$) decays to osmium
($_{76}^{188}Os$). The atomic masses of Pt-192 and Os-188 are
191.9614 and 187.9560 amu, respectively. How much energy is released in this reaction?

Show more…

Question #1
How many electrons are there in 1 g of carbon 6^12C, oxygen 8^16O, silicon 14^28Si, sulfur 16^34S, and calcium 20^40Ca?
Question #2
If K40 has a half-life of 1.4 × 10^9 years and only 10% of the
original K40 remains, how old is the earth?
QUESTION #3
The nucleus of platinum (78^192Pt) decays to osmium
(76^188Os). The atomic masses of Pt-192 and Os-188 are
191.9614 and 187.9560 amu, respectively. How much energy is released in this reaction?

Added by Albert G.

Chemistry: Structure and Properties

Nivaldo Tro 2nd Edition

Instant Answer

Solved by Expert Adi S

06/19/2023

Step 1

To do this, we need to divide the mass of each isotope by its molar mass: - Carbon (6C12): molar mass = 12 g/mol 1g / 12 g/mol = 0.0833 moles - Oxygen (8O16): molar mass = 16 g/mol 1g / 16 g/mol = 0.0625 moles - Silicon (14Si28): molar mass = 28 g/mol 1g / 28 Show more…

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Question #1 How many electrons are there in 1g of carbon _(6)C^(12), oxygen _(8)O^(16), silicon _(14)Si^(28), sulfur _(16)S^(34), and calcium _(20)Ca^(40) ? Question #2 If K^(40) has a half-life of 1.4 imes 10^(9) years and only 10% of the original K^(40) remains, how old is the earth? QUESTION #3 The nucleus of platinum ) decays to osmium ). The atomic masses of Pt-192 and Os-188 are 191.9614 and 187.9560amu , respectively. How much energy is released in this reaction? Question #1 How many electrons are there in 1 g of carbon 6C12, oxy. Question #2 If K40 has a half-life of 1.4 X 109 years and only 10% of the original K40 remains, how old is the earth? QUESTION #3 gy is released in this reaction?

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