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3 years ago

What is the temperature of liquid nitrogen?

Chemistry

1 answer:

motikmotik3 years ago

6 0

Really darn cold lol

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Describe how a plant meets the basic challenges of life???

Alinara [238K]

It can grow, reproduce, and produce/use energy. Hope this helps!!!

7 0

4 years ago

Be sure to answer all parts. Nitric oxide (NO) reacts with molecular oxygen as follows: 2NO(g) + O2(g) → 2NO2(g) Initially NO an

Ivenika [448]

Answer:

The remain gases are $o_{2}_{(g)}$ and $NO_{2}_{(g)}$

Pressure of $O_{2}_{(g)}$ $1.09 atm O_{2}_{(g)}$

Pressure of $NO_{2}_{(g)}$ $1.09 atm NO_{2}_{(g)}$

Explanation:

We have the following reaction

$2NO_{(g)} +O_{2}_{(g)}\longrightarrow 2NO_{2}_{(g)}$

Now we calculate the limit reagents, to know which of the two gases is completely depleted and which one is in excess.

Excess gas will remain in the tank when the reagent limits have run out and the reaction ends.

To calculate the limit reagent, we must calculate the mols of each substance. We use the ideal gas equation

$PV= nRT$

We cleared the mols

$n=\frac{PV}{RT}$

PV=nrT

replace the data for each gas

Constant of ideal gases

$R= 0.082\frac{atm.l}{mol.K}$

Transform degrees celsius to kelvin

$25+273=298K$

$NO_{g}$

$n=\frac{0.500atm.3.90l}{298k.0.082\frac{atm.l}{k.mol} } \\ \\ n=0.080mol NO_{(g)} \\$

$O_{2}_{(g)$

$n=\frac{1atm.2.09l}{298k.0.082\frac{atm.l}{k.mol} } \\ \\ n=0.086mol O_{2}_{(g)} \\$

Find the limit reagent by stoichiometry

$2NO_{(g)} +O_{2}_{(g)}\longrightarrow 2NO_{2}_{(g)}$

$0.086mol O_{2}_(g).\frac{2mol NO_{(g)} }{1mol O_{2}_{(g)} } =0.17mol NO_{(g)}$

Using $O_{2}_{(g)}$ as the limit reagent produces more $NO_{(g)}$ than I have, so oxygen is my excess reagent and will remain when the reaction is over.

$NO_{(g)}$

$2NO_{(g)} +O_{2}_{(g)}\longrightarrow 2NO_{2}_{(g)}\\ \\ 0.080mol NO_{(g)}.\frac{1mol O_{2}_ {(g)} }{2mol NO_{(g)} } =0.04mol O_{2}_{(g)}$

Using $NO_{(g)}$ as the limit reagent produces less $O_{2}_{(g)}$ than I have, so $NO_{(g)}$ is my excess reagent and will remain when the reaction is over.

Calculate the moles that are formed of $NO_{2}_{(g)}$

$2NO_{(g)} +O_{2}_{(g)}\longrightarrow 2NO_{2}_{(g)}\\ \\ 0.080mol NO_{(g)}.\frac{2mol NO_{2}_ {(g)} }{2mol NO_{(g)} } =0.080mol NO_{2}_{(g)}$

We know that for all $NO_{(g)}$ to react, 0.04 mol $O_{2}_{(g)}$ is consumed.

we subtract the initial amount of $O_{2}_{(g)}$ less than necessary to complete the reaction. And that gives us the amount of mols that do not react.

$0.086-0.04= 0.046$

The remain gases are $O_{2}_{(g)}$ and $NO_{2}_{(g)}$

calculate the volume that gases occupy

$0.080 mol NO_{2}_{(g)} .\frac{22.4l NO_{2}_{(g)} }{1molNO_{2}_{(g)} }} =1.79 lNO_{2}_{(g)}$

$0.046 mol O_{2}_{(g)} .\frac{22.4 l O_{2}_{(g)} }{1molO_{2}_{(g)} }} =1.03 l O_{2}_{(g)}$

Calculate partial pressures with the ideal gas equation

$PV= nRT$

$P=\frac{nRT}{V}$

Pressure of $O_{2}_{(g)}$

$P=\frac{0.046mol.0.082\frac{atm.l}{K.mol} 298K}{1.03l}= 1.09 atmO_{2}_{(g)}$

Pressure of $NO_{2}_{(g)}$

$P=\frac{0.080mol.0.082\frac{atm.l}{K.mol} 298K}{1.79l}= 1.09 atmNO_{2}_{(g)}$

8 0

3 years ago

Read 2 more answers

Hydrogen has an average atomic mass of 1.008 amu and has 3 known isotopes

NISA [10]

Answer:

Hydrogen-1

Protium is the most abundant isotope of hydrogen.The abundances of protium, deuterium and tritium are 99.984%,0.016% and 10 to the power –15 respectively.

3 0

4 years ago

Explain with examples following characteristics of chemical reactions: a. Change of colour b. Evolution of gas c. Change of smel

Andrei [34K]

Answer:

Explanation:

a. change of colour:

A chemical reaction rearranges the constituent atoms of the reactants to create different substances as products. The products have different molecular structures than the reactants. Different atoms and molecules radiate different colours of light. Hence, there usually is a change in colour during a chemical reaction.

Eg: copper reactions with the elements

b. Evolution of gas:

A gas evolution reaction is a chemical reaction in which one of the end products is a gas such as oxygen or carbon dioxide.

Eg: ammonium hydroxide breaks down to water and ammonia gas.

c. Change of smell :

Production of an Odor Some chemical changes produce new smells. ... The formation of gas bubbles is another indicator that a chemical change may have occured.

Eg: The chemical change that occurs when an egg is rotting produces the smell of sulfur.

d. Change of state:

A chemical reaction is a process in which one or more substances, also called reactants, are converted to one or more different substances, known as products.

Eg: candle wax (solid) melts initially to produce molten wax (liquid)

plz mark as brainliest!!!!

4 0

4 years ago

Determine the volume, in liters, occupied by 0.015 molecules of oxygen at STp?

Arlecino [84]

5.58 X $10^{-25}$ Litres is the volume, in liters, occupied by 0.015 molecules of oxygen at STP.