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ad-work [718]
3 years ago
10

A 0.800 g sample of cuso4 (s was placed in calorimeter with 43.0g of water at an initial temp of 18.3 degrees celcious. as the c

uso(s dissolves in water, the temp increases to 20.2 degrees celcious. what value of /\h can be determined.
Chemistry
1 answer:
Serhud [2]3 years ago
6 0
Hello it's 92479x027430=3057292
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Radio active decay reactions follow first order rate kinetics.

a) The half life and decay constant for radio active decay reactions are related by the equation:

t_{\frac{1}{2}} =\frac{ln 2}{k}

t_{\frac{1}{2}} = \frac{0.693}{k}

Where k is the decay constant

b) Finding out the decay constant for the decay of C-14 isotope:

Decay constant (k) = \frac{0.693}{t_{\frac{1}{2}}}

k = \frac{0.693}{5230 years}

k = 1.325 * 10^{-4} yr^{-1}

c) Finding the age of the sample :

35 % of the radiocarbon is present currently.

The first order rate equation is,

[A] = [A_{0}]e^{-kt}

\frac{[A]}{[A_{0}]} = e^{-kt}

\frac{35}{100} = e^{-(1.325 *10^{-4})t}

ln(0.35) = -(1.325 *10^{-4})(t)

t = 7923 years

Therefore, age of the sample is 7923 years.

3 0
3 years ago
Explain why the column of a fractional distillation apparatus should be aligned as near to the vertical as possible
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<span><span>The column of a fractional distillation apparatus should be aligned vertical to get better separation because the column is essentially longer. It will prevent channeling in the column. </span>Therefore column efficiency will be higher if it is as vertical as possible instead of tilted.<span> Distillation is a process used to separate a mixture of two (or more) components. In a typical </span>fractional distillation, a liquid mixture is heated in the distilling flask and the process begins.</span>
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3 years ago
What affect does attendance have on students' grades in science class? Write the independent variable, the dependent variable, a
alexira [117]
Independent variable: the student chooses to miss class.
dependent variable: in result of the student missing class his grade goes down.
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3 years ago
According to the MyPyramid plan, which foods should be the smallest portion of a teen’s diet?
Jobisdone [24]
The answer is GRAINS 


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7 0
3 years ago
Read 2 more answers
How many grams are in 4.3 x 10 -4 moles of calcium phosphate?
attashe74 [19]

Explanation:

Ca3(PO4)2 1 mole has 310.2 g

Ca3(PO4)2 4.3 × 10^-4 moles has 4.3 × 10^-4 × 310.2

= 1,333.86 × 10^-4

= 1.334 × 10^-1

OR 0.1334 g

5 0
2 years ago
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