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3 years ago

Why do you think radioactive decay is measured in half lives, based on the characteristics of the graph.

Chemistry

1 answer:

GREYUIT [131]3 years ago

3 0

The radio active decay of a substance or any chemical is measured in half-lives because of the period where there are significant changes in the amount of the chemicals. The amount of chemical is almost halved in the next period as is suggested by the given graph.

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the minimum frequency of radiation that will produce a photoelectric effect

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Name three parts of a plant cell that are not found in an animal cell

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The partial pressure of CH4 is 0.175 atm and that of O2 is 0.250 atm in a mixture of the two gases. What is the mole fraction of

tresset_1 [31]

Answer:

The total number of moles of gas in the mixture is 0.16939.

1.25550 grams of methane gas and 3.18848 grams of oxygen gas.

Explanation:

Total volume of the mixture = V = 10.5 L

Temperature of the mixture = T = 35°C = 308.15K

Pressure of the mixture = P

Total moles of mixture = n = $n_1+n_2$

Using an ideal gas equation :

$PV=nRT$

$P\times 10.0 L=n\times 0.0821 atm L/mol K\times 308.15 K$

$P=2.509 n$

Partial pressure of the methane= $p_1=0.175 atm$

Moles of the methane= $n_1$

Partial pressure of the oxygen gas= $p_2=0.250 atm$

Moles of the methane= $n_2$

Mole fraction of the methane= $\chi_1=\frac{n_1}{n_1+n_2}$

Mole fraction of the oxygen gas= $\chi_2=\frac{n_2}{n_1+n_2}$

$p_1=p\times \chi_1$ (Dalton's law)

$0.175 atm=P\times \frac{n_1}{n_1+n_2}$

$0.175 atm=(2.509 n)\times \frac{n_1}{n}$

$n_1=0.06975 mol$

Mass of 0.06975 moles of methane gas :

0.06975 mol × 18 g/mol =1.25550 g

$p_2=p\times \chi_2$ (Dalton's law)

$0.250 atm=P\times \frac{n_2}{n_1+n_2}$

$0.250 atm=(2.509 n)\times \frac{n_2}{n}$

$n_2=0.09964 mol$

Mass of 0.06975 moles of oxygen gas :

0.09964 mol × 32 g/mol =3.18848 g

Total moles of mixture = n = $n_1+n_2$

[/tex]=0.06975 mol+0.09964 mol=0.16939 mol[/tex]

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cricket20 [7]

Answer:

a) element

b) compound

c) element

d) compound

Explanation:

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c) gold: is the chemical element with the symbol Au. It is a very dense, soft and intense yellow metal.

d) sugar: it is a compound whose chemical formula is C12H22O11

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