The reaction of Ca(oH)2 with HCl produces calcium chloride (CaCl2) and water (H2O). The stiochiometric equation is 2HCl + Ca(OH)2 = CaCl2 + 2H2O. In this case, 2 moles of HCl stoichiometrically reacts with one mole of calcium hydroxide. Hence for 3.5 moles of Ca(OH)2, there should be 1.75 moles of HCl needed. Given 0.85 M HCl, to get the volume, we divide 1.75 moles by 0.85 M. The volume needed is 2.0588 liters.

5 0

2 years ago

A mover packs books, CDs, and DVDs into a moving box. If the box contains 6.5 kg of books, 1.5 kg of CDs, and 2.0 kg of DVDs, wh

IrinaVladis [17]

Answer:

$\text{Mass percentage}=\frac{\text{Mass of the substance}}{\text{Total mass}}\times 100$

Given: Mass of books = 6.5 kg

Mass of CD's = 1.5 kg

Mass of DVD's = 2.0 kg

Total mass = 6.5 kg + 1.5 kg + 2.0 kg = 10 kg

$\text {Mass percentage of books}=\frac{6.5kg}{10kg}\times {100}=65\%$

$\text {Mass percentage of CD's}=\frac{1.5kg}{10kg}\times {100}=15\%$

$\text {Mass percentage of DVD's}=\frac{2.0kg}{10}\times {100}=20\%$

7 0

3 years ago

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Which of the following is the most reasonable explanation for a drop in temperature of gas?

ozzi

Answer: The correct answer is option B.

Explanation:

Average kinetic energy of the gas molecule is given by relation:

$E_K=\frac{3}{2}\frac{R}{N_A}\times T$

$N_A$ = Avogadro Number

T = Temperature of the gas in Kelvins.

R = Universal gas constant

$E_K\propto T$

With increase in temperature the kinetic energy of the gas molecule increases and vice-versa.

So, according to the question the explanation for a drop in temperature of the gas is decrease in average kinetic energy of the gas molecules.

Hence, the correct answer is option B.

3 0

3 years ago

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In your own words, explain the Law of Conservation of Mass.

weeeeeb [17]

Answer:

Here's my definition (in my own words)

Explanation:

In any closed system... no matter what reactions occur, the mass of the system will remain the same. Mass will not be destroyed, rather it will just be "converted" to something else.

8 0

2 years ago