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3 years ago

In the chemical laboratory, what does a mortar and pestle function as?. .

Chemistry

2 answers:

likoan [24]3 years ago

5 0

B. it is used to crush substances therefore it would be decreasing the surface area

Eduardwww [97]3 years ago

3 0

In a chemical laboratory, a mortar and pestle function is to decrease surface area of a solute. The correct answer is B.

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The vapor pressure of water is 1.00 atm at 373 K, and the enthalpy of vaporization is 40.68 kJ mol!. Estimate the vapor pressure

Yuki888 [10]

Answer:

The vapor pressure at temperature 363 K is 0.6970 atm

The vapor pressure at 383 K is 1.410 atm

Explanation:

To calculate $\Delta H_{vap}$ of the reaction, we use clausius claypron equation, which is:

$\ln(\frac{P_2}{P_1})=\frac{\Delta H_{vap}}{R}[\frac{1}{T_1}-\frac{1}{T_2}]$

where,

$P_1$ = vapor pressure at temperature $T_1$

$P_2$ = vapor pressure at temperature $T_2$

$\Delta H_{vap}$ = Enthalpy of vaporization

R = Gas constant = 8.314 J/mol K

1) $\Delta H_{vap}=40.68 kJ/mol=40680 J/mol$

$T_1$ = initial temperature =363 K

$T_2$ = final temperature =373 K

$P_2=1 atm, P_1=?$

Putting values in above equation, we get:

$\ln(\frac{1 atm}{P_1})=\frac{40680 J/mol}{8.314J/mol.K}[\frac{1}{363}-\frac{1}{373}]$

$P_1=0.69671 atm \approx 0.6970 atm$

The vapor pressure at temperature 363 K is 0.6970 atm

2) $\Delta H_{vap}=40.68 kJ/mol=40680 J/mol$

$T_1$ = initial temperature =373 K

$T_2$ = final temperature =383 K

$P_1=1 atm, P_2?$

Putting values in above equation, we get:

$\ln(\frac{P_2}{1 atm})=\frac{40680 J/mol}{8.314J/mol.K}[\frac{1}{373}-\frac{1}{383}]$

$P_2=1.4084 atm \approx 1.410 atm$

The vapor pressure at 383 K is 1.410 atm

8 0

3 years ago

what is the percent by mass of a solution that contains 30 grams of potassium nitrite in 0.5 kilograms of water?

Makovka662 [10]

Answer:

5.66 %.

Explanation:

mass percent is the ratio of the mass of the solute to the mass of the solution multiplied by 100.

mass % = (mass of solute/mass of solution) x 100.

mass of potassium nitrite = 30.0 g,

mass of the solution = mass of water + mass of potassium nitrite = 500.0 g + 30.0 g = 530.0 g.

∴ mass % = (mass of solute/mass of solution) x 100 = (30.0 g/530.0 g) x 100 = 5.66 %.

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3 years ago

Ok here is the next one I’m counting on you Thanks.

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The cell theory tells us that _____.

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hope this helped :)
alisa202

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3 years ago

A carbon compound X turns blue litmus to red and has a molecular formula C2H4O2.Identify X and draw its structure.Write a chemic

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X is acetic acid or CH3COOH Acetic acid belongs to the homologous series; alkanoic acids; which are group of weak acids. They react with alkanols or alcohols to form esters or what we call alkyl alkanoates in presence of concentrated sulfuric acid. Additionally, they react with carbonates to yield a salt, water and carbon dioxide gas.
(a) Acetic acid reacts with ethanol to form ester in presence of concentrated sulphuric acid (H2SO4) CH3COOH + C2H5OH ----------------------> CH3COOC2H5 + H2O Product formed is Ethyl ethanoate or ethyl acetate.

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3 years ago

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