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alexandr1967 [171]
3 years ago
6

Magnesium has three naturally occurring isotopes with masses of 23.99 amu, 24.99 amu, and 25.98 amu and natural abundances of 78

.99%, 10.00% and 11.01% respectively. How do you calculate the atomic mass of magnesium?
Chemistry
1 answer:
mihalych1998 [28]3 years ago
3 0

Answer:24.31

Explanation:Contribution made by isotope of mass 23.99= 23.99×78.99=1894.97

Contribution made by isotope of mass 24.99=24.99×10.00=249.9

Contribution made by isotope of mass 25.98=25.98×11.01=286.04

Total contribution=1894.97+249.9+286.04=2430.91

Average mass=2430.91÷100

=24.31

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Answer: hot

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Endothermic reactions are defined as the reactions in which energy of the product is greater than the energy of the reactants. The total energy is absorbed in the form of heat and the system will be hot and surroundings will be cold.

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45.5 g of ice is heated from -25 degrees celsius to 150 degrees celcius. Calculate the total amount of heat required for the ent
tino4ka555 [31]

Answer:

Q = 16163.88 Joules

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Given the following data;

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To find the quantity of heat required;

Heat capacity is given by the formula;

Q = mcdt

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The process of heat transfer from ground to the air touching it is convection. It involves particles of the air.

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Convection brainly.com/question/1140127

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