A 1.2 kg sample of Th-228 has a half-life of 1.9 years. How many grams of Th is left after 13.3 years?

1 answer:

Bumek [7]3 years ago

7 0

.009375 kg or 9.375 grams will remain

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FromTheMoon [43]

So I believe you are supposed to take notes based on the guiding questions (the questions on the side).

3 0

3 years ago

leonid [27]

Answer:

The correct answer is m= mol solute kg soivent

Explanation:

Molality is a measure of concentration, which indicates the moles of solute (in this case sodium hydroxide) in 1kg of solvent .

In this case:

0,800 kg water-----0,400 mol NaOH

1 ,000 kg water ---x=(1 ,000 kg water x 0,400 mol NaOH)/0,800 kg water

x=0,5 mol NaOH---> <em>The solution is 0,5 molal (0,5 m)</em>

6 0

3 years ago

wariber [46]

Answer:

Ethyl heptanoate (see the attached image for the structure).

Explanation:

The reaction of heptanoic acid and ethanol will result ethyl heptanoate ester.

Ethyl heptanoate is the ester resulting from the condensation of heptanoic acid and ethanol. It is used in the flavor industry because of its odor that is similar to grape.
Kindly, see the attached image of the structure and the reaction.

3 0

3 years ago

ANEK [815]

Answer:

the right side of the arrow.

Explanation:

reactants are on left because they are the ones reacting. products are on the right because they are the final products.

3 0

3 years ago

svlad2 [7]

Answer:

you need to have a question or a problem first

7 0

3 years ago