All categories

4 years ago

, Compounds, and Mixtures

Chemistry

1 answer:

valkas [14]4 years ago

6 0

Answer:

okay

Explanation:

so elements are basics building blocks compounds are materials such as water and mixture is like sugar and water hope this helps

You might be interested in

How many atoms of nitrogen (N) are in this compound? <br> 3 Pb(NO3)4

Studentka2010 [4]

Answer:

12 nitrogen atoms

Explanation:

This is essentially 3 molecules of Lead (IV) Nitrate, And since there were originally 4 nitrogen atoms in this single ionic compound, there are now 12 total

4 0

3 years ago

The vapor pressure of ethanol is 1.00 × 102 mmHg at 34.90°C. What is its vapor pressure at 60.21°C? (ΔHvap for ethanol is 39.3 k

Delicious77 [7]

Answer:

The vapor pressure at 60.21°C is 327 mmHg.

Explanation:

Given the vapor pressure of ethanol at 34.90°C is 102 mmHg.

We need to find vapor pressure at 60.21°C.

The Clausius-Clapeyron equation is often used to find the vapor pressure of pure liquid.

$ln(\frac{P_2}{P_1})=\frac{\Delta_{vap}H}{R}(\frac{1}{T_1}-\frac{1}{T_2})$

We have given in the question

$P_1=102\ mmHg$

$T_1=34.90\°\ C=34.90+273.15=308.05\ K\\T_2=60.21\°\ C=60.21+273.15=333.36\ K\\\Delta{vap}H=39.3 kJ/mol$

And $R$ is the Universal Gas Constant.

$R=0.008 314 kJ/Kmol$

$ln(\frac{P_2}{102})=\frac{39.3}{0.008314}(\frac{1}{308.05}-\frac{1}{333.36})\\\\ln(\frac{P_2}{102})=4726.967(\frac{333.36-308.05}{333.36\times308.05})\\\\ln(\frac{P_2}{102})=4726.967(\frac{25.31}{333.36\times308.05})\\\\ln(\frac{P_2}{102})=4726.967(\frac{25.31}{102691.548})\\\\ln(\frac{P_2}{102})=1.165$

Taking inverse log both side we get,

$\frac{P_2}{102}=e^{1.165}\\\\P_2=102\times 3.20\ mmHg\\P_2=327\ mmHg$

8 0

3 years ago

How many grams of NaI are needed to prepare 400.0 mL of 0.0500 M NaI solution?

Simora [160]

Answer:

3g of NaI is needed to prepare 400.0 mL of 0.0500 M NaI solution.

Explanation:

A 0.0500M solution means that is 0.0500 moles of NaI per every 1000 mL of solution. Thus, to prepare 400mL:

$\frac{400mL}{1000mL}x0.0500moles=0.0200moles$

Also, the molar mass of NaI is 127g/mol + 23g/mol = 150g/mol

Consequently, multiplying the molar mass of NaI by the moles the necessary mass is obtained:

$150\frac{g}{mol}x0.0200moles = 3g$

4 0

4 years ago

Read 2 more answers

Leucippus and Democritus proposed the "first" atomic view of matter. They arrived at this view based on

erik [133]

Answer:

C) philosophical and intuitive speculation

Explanation:

Leucippus and Democritus proposed the concept of an atom based on philosophical speculation as a way of explaining reality with the scarcity of data available at that time.

The ideas of Leucippus and Democritus were rejected at that time but later retaken by Dalton when proposing his atomic model.

Success with your homework.

3 0

4 years ago

Please help. I’m terrible with weather

Harrizon [31]

first know the difference between the 4 seasons or weather's that occur and that will help get through

4 0

3 years ago