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1 year ago

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select the correct answer from each drop down menu how do you the freezing point and boiling point of a solution compare with th

ose of us pure solvent? The freezing point of the solution is ___ and the boiling point is _____ than that of its pure solvent.

1 answer:

miss Akunina [59]1 year ago

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Explanation:

select the correct answer from each drp down

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Strontium-90 is a radioisotope that will decrease in mass by one-half every 29 years. How many years will it take for a 10.0-gra

Lelechka [254]

Answer: It will take 29 years for a 10.0-gram sample of strontium-90 to decay to 5.00 grams

Explanation:

Radioactive decay process is a type of process in which a less stable nuclei decomposes to a stable nuclei by releasing some radiations or particles like alpha, beta particles or gamma-radiations. The radioactive decay follows first order kinetics.

Half life is the amount of time taken by a radioactive material to decay to half of its original value.

Half life is represented by $t_{\frac{1}{2}$

$t_{\frac{1}{2}=\frac{0.693}{\lambda}$

$\lambda$ = rate constant

Given : Strontium-90 decreases in mass by one-half every 29 years , that is half life of Strontium-90 is 29 years.

As half life is independent of initial concentration, it will take 29 years for a 10.0-gram sample of strontium-90 to decay to 5.00 grams as the amount gets half.

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3 years ago

How many atoms are in 163 g of calcium?

I am Lyosha [343]

<span>Avogadro's number represents the number of units in one mole of any substance. This has the value of 6.022 x 10^23 units / mole. This number can be used to convert the number of atoms or molecules into number of moles.

163 g Ca (1 mol / 40.08 g) ( </span>6.022 x 10^23 atoms / 1 mol ) = 2.45 x10^24 atoms Ca

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3 years ago

Read 2 more answers

What is the mass of 5.2 moles of ca(no3)2

zhannawk [14.2K]

Mass to moles
5.2 mol/Ca(no3)2 to mol
5.2 mol/Ca(no3)2 / molar mass
5.2 mol/Ca(no3)2 / 164.1= 0.032 g/Ca(no3)2

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2 years ago

What is 155.4g÷8.70mL, rounded to the correct number of significant figures

OLEGan [10]

Answer:

17.9g/ml

Explanation:

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2 years ago

What quantity is represented by the metric system prefix deci-?

mario62 [17]

10. For example, decagon and decade.

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3 years ago