3 years ago

Which liquid would be the most difficult to raise or lower the temperature of

Chemistry

1 answer:

scoundrel [369]3 years ago

6 0

Answer:

its either A or D

H0p3 th1$ H3lp$

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A water treatment tablet contains 20.0 mg of tetraglycine hydroperiodide, 40.0% of which is available as soluble iodine. If two

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$16\ \text{ppm}$

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Mass of one tablet = 20 mg

Mass of two tablets = $2\times 20=40\ \text{mg}$

Percent that is soluble in water = 40%

Mass of tablet that is soluble in water = $0.4\times 40=16\ \text{mg}$

So, mass of solute is $16\ \text{mg}$

Density of water = 1 kg/L

Volume of water = 1 L

So, mass of 1 L of water is $1\times 1=1\ \text{kg}=1000\ \text{g}$

PPM is given by

$\dfrac{\text{Mass of solute}}{\text{Mass of solvent}}\times 10^6=\dfrac{16\times 10^{-3}}{1000}\times 10^6\\ =16\ \text{ppm}$

Hence, the concentration of iodine in the treated water $16\ \text{ppm}$ .

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How many moles are in 124.7 g of Ba(OH)2

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0.73 mol

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No. of moles(n)= Given mass/molar mass.

Given mass=124.7g

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No. of moles= 124.7g/171g=0.73 mol

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Which elements in the periodic table are metalloids or have semimetallic properties?

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B, As only are metalloids or have semimetallic properties.

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