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3 years ago

6

Why does the mass number for an element differ from the average atomic mass for the element?

1 answer:

yarga [219]3 years ago

4 0

Answer:

the mass number is the number of protons and neutrons added and the average atomic mass is the weight of the protons and neutrons

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Which fatty acid salt is soluble in water solutions?

Oliga [24]

Answer is (A)
Pottasium and Sodium salts are soluble in water. When these soaps are added to hard water. Hard water contains calcium or magnesium ions and they form Magnesium or Calcuim salts. These salts of magnesium and calcium precipitates out and are insoluble in water. This precipitation is called as dirt (the exact word for dirt is not acceptable here). This process is considered as the disadvantage of soap as well as using hard water.

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3 years ago

Technetium has a half-life of six hours. If you obtain 100g of a pure technetium sample, after 18 hours how much of the pure sub

IgorLugansk [536]

Answer:

After 18 hours, the amount of pure technetium that will be remaining is 12.5 grams

Explanation:

To solve the question, we note that the equation for half life is as follows;

$N(t) = N_0 (\frac{1}{2} )^{\frac{t}{t_{1/2}}$

Where:

N(t) = Quantity of the remaining substance = Required quantity

N₀ = Initial radioactive substance quantity = 100 g

t = Time duration = 18 hours

${t_{1/2}$ = Half life of the radioactive substance = 6 hours

Therefore, plugging in the values, we have;

$N(t) = 100 (\frac{1}{2} )^{\frac{18}{6}} = 100 (\frac{1}{2} )^{3} = \frac{100 }{8} = 12.5 \ grams$

Therefore, after 18 hours, the amount of pure technetium that will be remaining = 12.5 grams.

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3 years ago

Use the periodic table to match each of the following element symbols to its name, atomic mass, or atomic number. (3 points)

bonufazy [111]

Answer:

Tin I thunk

Explanation:

I think

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3 years ago

Which organic compound is most soluble in water? A) ethyne B) benzene C) butane D) ethanol

nataly862011 [7]

I think it's between B) Benzene and C) Butane

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3 years ago

What volume will 35.9 g of hydrogen gas (H2) occupy at STP?

Nataly [62]

35.9g x 1 mol/ 2.016g x 22.4 L/ 1 mol= 398.89 L

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3 years ago

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