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3 years ago

14

there are 125 lima beans 56 garbanzo beans 39 kidney beans and 144 green peas in a container. find the percent by number of gree

n peas in the container, explain why.

1 answer:

Sauron [17]3 years ago

5 0

39.6% of the beans are green beans

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How many atoms of carbon are in the sample

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There are six atoms in the carbon

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Which of the following environments is most likely to have days with a relative humidity of less than 10% (ten percent)?

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Answer:

Desert

Explanation:

Desert barely have any water therefore they can barely produce any amount of humidity

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3 years ago

Consider the following properties: I) The red color of rubies is due to the presence of chromium ions. II) Objects made of silve

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Answer:

II) Objects made of silver become tarnished.

Explanation:

Physical properties are the properties which can be observed without changing identity of substance.

Chemical properties are the properties which describe how the substance changes into the different substance completely.

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3 years ago

How many pi bonds are in the oxalate ion (C2O42-)?

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Explanation:

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3 years ago

Using the systematic approach for equilibrium problems, calculate the pH of 0.05 M HOCl. Ka= 3.0*10-8 Group of answer choices 3.

SVEN [57.7K]

Answer:

The pH is equal to 4.41

Explanation:

Since HClO is a weak acid, its dissociation in aqueous medium is:

HClO ⇄ ClO- + H+

start: 0.05 0 0

change -x +x +x

balance 0.05-x x x

As it is a weak acid it dissociates very little, in its ClO- and H + ions, so the change is negative, where x is a degree of dissociation.

the acidity constant when equilibrium is reached is equal to:

$Ka=\frac{[ClO-]*[H+]}{[HClO]}=\frac{x*x}{0.05-x}=3x10^{-8}$

The 0.05-x fraction can be approximated to 0.05, because the ionized fraction (x) is very small, therefore we have:

$3x10^{-8}=\frac{x^{2} }{0.05}$

clearing the x and calculating its value we have:

$x=3.87x10^{-5}=[H+]=[ClO-]$

the pH can be calculated by:

$pH=-log[H+]=-log[3.87x10^{-5}]=4.41$

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3 years ago