If the colors in a chromatography are able to dissolve and travel up a paper wick, what kind of chemical property do the colors have when mixed with rubbing alcohol?

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4 0

1 year ago

To calculate the density of a sample of matter,you must divide it_____ by its______.

Ymorist [56]

I think it is voulume and total mass

8 0

2 years ago

What is the density (g/L) of NH3 at 105 kpa and 25 C ( 0.721 g/mol)?

jenyasd209 [6]

Answer:

0.721 g/L

Explanation:

Ideal gas equation ->PV= nRT ; n= mass (m)/ molar mass (M);

densitiy= mass (m)/ volume (V)

PV= (m/M)*RT -> PVM= mRT -> PM/RT= m/V -> PM/RT=d

We need to put in SI units

105 Kpa= 1.04 atm

25°C= 298 K

d= (1.04 atm * 17 g/ mol)/(0.0821 * 298 K) = 0.721 g/L

3 0

3 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

2 years ago

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