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3 years ago

What is sublimation and what type change is this?

Chemistry

1 answer:

bixtya [17]3 years ago

6 0

Answer:

Sublimation is a physical change. When a substance sublimes, it changes from a solid to a gas without going through the liquid phase.

Explanation:

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Deep sea divers use a mixture of helium and oxygen to breathe. Assume that a diver is going to a depth of 150 feet where the tot

Svetlanka [38]

Answer:

4.525% is the percentage by volume of oxygen in the gas mixture.

Explanation:

Total pressure of the mixture = p = 4.42 atm

Partial pressure of the oxygen = $p_1=0.20 atm$

Partial pressure of the helium = $p_2$

$p_1=p\times \chi_1$ (Dalton law of partial pressure)

$0.20 atm=4.42 atm\times \chi_1$

$\chi_1=\frac{0.20 atm}{4.42 atm}=0.04525$

$\chi_2=1-\chi_1=1-0.04525=0.95475$

$chi_1+chi_2=1$

$n_1=0.04525 mol,n_2=0.95475 mol$

According Avogadro law:

$Moles\propto Volume$ (At temperature and pressure)

Volume occupied by oxygen gas = $V_1$

Total moles of gases = n = 1 mol

Total Volume of the gases = V

$\frac{n_1}{V_1}=\frac{n}{V}$

$\frac{V_1}{V}=\frac{n_1}{n}=\frac{0.04525 mol}{1 mol}$

Percent by volume of oxygen in the gas mixture:

$\frac{V_1}{V}\times 100=\frac{0.04525 mol}{1 mol}\times 100=4.525\%$

6 0

4 years ago

I have an unknown volume of gas at a pressure of 0.5 atm and a temperature of 325k if I raise the pressure to 1.2 atm, decrease

Nimfa-mama [501]

Use the Equation of Clapeyron:

$\frac{P_1.V_1}{T_1}=\frac{P_2.V_2}{T_2}\\
\\
\frac{0.5V_1}{235}=\frac{1.2*48}{320}\\
\\
320*0.5V_1=235*1.2*48\\
\\
V_1=\frac{235*1.2*48}{320*0.5}=84.5 liters$

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3 years ago

What happen when Nacl solution reacts with AgNo3 solution

Anna71 [15]

Answer:

hii

Explanation:

NaCl + AgNO3 = AgCl + NaNO3

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4 years ago

A student measures a volume as 25 ml, wheras the correct volume is 23 mL. What is the percent error?

otez555 [7]

Answer:

the other number is different

Explanation:

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3 years ago

15g of hydrogen gas reacts exactly with 70g of nitrogen gas to produce ammonia, NH3. deduce the balanced equation for the reacti

GrogVix [38]

Answer:

3H2 + N2 ---> 2NH3

Explanation:

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3 years ago