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3 years ago

10

Intravenous saline solutions are often administered to patients in the hospital. Normal saline solution containers has a concent

ration of 0.20 M and a volume of 0.10L of solution. How many moles of sodium chloride were dissolved? *
2 points
0.02 mol
2.0 mol
0.5 mol
5 mol

1 answer:

zalisa [80]3 years ago

8 0

0.02 mol NaCl

Explanation:

(0.2M NaCl)×(0.10 L) = 0.02 mol NaCl

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3 years ago

a sample of helium occupies a volume of 101.2 mL at a pressure of 790 mmHg. at what pressure would the volume be 120 mL?

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Answer : The final pressure will be, 666.2 mmHg

Explanation :

Boyle's Law : It is defined as the pressure of the gas is inversely proportional to the volume of the gas at constant temperature and number of moles.

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$P_1V_1=P_2V_2$

where,

$P_1$ = initial pressure = 790 mmHg

$P_2$ = final pressure = ?

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2 years ago

Radioactive decay can be described by the following equation where is the original amount of the substance, is the amount of the

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Answer:

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Explanation:

Half life of iron -55 = 2.737 years (Source)

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Where, k is rate constant

So,

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

$k=\frac {ln\ 2}{2.737}\ year^{-1}$

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Using integrated rate law for first order kinetics as:

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$[A_0]$ is the initial concentration

So,

$[A_t]=32.2\times e^{-0.2533\times 2.41}\ mg$

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2 years ago

Which one of these is NOT a sign of chemical change? *

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3 years ago

Given the following list of densities, which materials would float in a molten vat of lead provided that they do not themselves

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Answer:

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Density is an intrinsic property of matter. Less dense materials float in more dense materials. The materials whose density is lower than that of lead and will therefore float on it are glass and charcoal.

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2 years ago