Convection currents not only occurs in the air but also in other fluids like water. In the air, they are responsible for the blowing of winds of the atmosphere . In the oceans, they are responsible for ocean currents. Convection currents also occur in the mantle and are responsible for tectonic plate movements.

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4 0

3 years ago

A mixture of 50 wt% methane, 35 wt% ethane, and 15 wt% propane. Determeine the mole fraction of methane.

dmitriy555 [2]

Answer:

a) Molar fraction:

Methane: 67,5%

Ethane: 25,1%

Propane: 7,4%

b) Molecular weight of the mixture: 25,16 g/mol

Explanation:

with a basis of 100 kg:

Moles of methane:

500 g × $\frac{1mol}{16,04 g}$ = 31,2 moles

Mass of ethane

350 g × $\frac{1mol}{30,07 g}$ = 11,6 moles

Mass of propane

150 g × $\frac{1mol}{44,1 g}$ = 3,4 moles

Total moles: 31,2 moles + 11,6 moles + 3,4 moles = 46,2 moles

Molar fraction of n-methane:

$\frac{31,2moles}{46,2moles}$ =67,5%

Molar fraction of ethane:

$\frac{11,6moles}{46,2moles}$ = 25,1%

Molar fraction of propane:

$\frac{3,4moles}{46,2moles}$ = 7,4%

b) Average molecular weight:

$0,5*16,04g/mol + 0,35*30,07g/mol+0,15*44,1g/mol}$ = 25,16g/mol

I hope it helps!

5 0

3 years ago

Sophia and her friend Nora have the same unknown solid. Sophia has progressed a little faster with the purification process, but

Katarina [22]

Answer:

Nora used a minimal volume of hot solvent, this hot mixture was filtered to remove insoluble impurities. She had to perform a rapid filtration with a minimum of evaporation in a short-stemmed funnel previously heated in an oven, and provided with a pleated filter to increase the filtration rate, so in this way she prevented the product from crystallizing prematurely on the funnel stem.

If with this technique does not reach a pure substance, the process can be repeated by heating the solvent, changing the funnel or looking for a solvent with high dissolution power of the substance.

Explanation:

The solid products obtained in a reaction are usually accompanied by impurities that must be removed in order to dispose of the desired product in the highest possible purity. The most suitable method for removing impurities that contaminate a solid is by crystallization either in a pure solvent or in a mixture of solvents. This procedure is given the generic name of recrystallization.

3 0

3 years ago

Covalent solutes are considered non-electrolytes. What does this mean for the conductivity of the solution?

Mashutka [201]

Answer:

Non-electrolytes dissolve and do not dissociate in water providing no charged ions to conduct electricity.

Explanation:

3 0

3 years ago