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3 years ago

ILL GIVE BRAINLY, 5 STARS , FOLLOW AND HEARTS

Chemistry

2 answers:

Jlenok [28]3 years ago

6 0

Answer:

Second one

Explanation:

I think it's the second cause there's no energy w/o heat. So it's the second.

nikdorinn [45]3 years ago

5 0

Answer:

The second option

Explanation:

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How many grams of KCl 03 are needed to produce 6.75 Liters of O2 gas measured at 1.3 atm pressure and 298 K?

Nina [5.8K]

11.48-gram of $KCl0_3$ are needed to produce 6.75 Liters of $O_2$ gas measured at 1.3 atm pressure and 298 K

<h3>What is an ideal gas equation?</h3>

The ideal gas law (PV = nRT) relates the macroscopic properties of ideal gases. An ideal gas is a gas in which the particles (a) do not attract or repel one another and (b) take up no space (have no volume).

First, calculate the moles of the gas using the gas law,

PV=nRT, where n is the moles and R is the gas constant. Then divide the given mass by the number of moles to get molar mass.

Given data:

P= 1.3 atm

V= 6.75 Liters

n=?

R= $0.082057338 \;L \;atm \;K^{-1}mol^{-1}$

T=298 K

Putting value in the given equation:

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

$n= \frac{1.3 \;atm\; X \;6.75 \;L}{0.082057338 \;L \;atm \;K^{-1}mol^{-1} X 298}$

Moles = 0.3588 moles

Now,

$Moles = \frac{mass}{molar \;mass}$

$0.3588 moles = \frac{mass}{32}$

Mass= 11.48 gram

Hence, 11.48-gram of $KCl0_3$ are needed to produce 6.75 Liters of $O_2$ gas measured at 1.3 atm pressure and 298 K

Learn more about the ideal gas here:

brainly.com/question/27691721

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3 0

2 years ago

How old was this tree when it was cut down?

son4ous [18]

Do you have more information than this
Is it a story?

5 0

2 years ago

Sound travels faster through solids than it does through either liquids or gases a student could verify this statement by

irina [24]

Group of answer choices.

A. Distance that sound travels through a solid, a liquid, and a gas.

B. Pitch of sound when it passes through a solid, a liquid, and a gas.

C. Distance sound travels through a solid, a liquid, and a gas at varying temperatures.

D. Time required for sound to travel a set distance through a solid, a liquid, and a gas.

Answer:

D. Time required for sound to travel a set distance through a solid, a liquid, and a gas.

Explanation:

Sound are mechanical waves that are highly dependent on matter for their propagation and transmission.

Sound travels faster through solids than it does through either liquids or gases. A student could verify this statement by measuring the time required for sound to travel a set distance through a solid, a liquid, and a gas.

Mathematically, the time required for sound to travel is given by this formula;

$Time = \frac {distance (x)}{speed (v)}$

Hence, the time taken for sound to travel through each medium (solid, liquid and gas) would be measured, recorded and compared to one another.

4 0

3 years ago

A chemist carefully measures the amount of heat needed to raise the temperature of a 0.47 kg sample of C6H7N from 30.5 degrees C

Vadim26 [7]

Answer:

Mass of the sample = m = 894.0 g

Initial temperature of the sample = T_i=-5.8^oC=267.35 KT

=−5.8

C=267.35K

Final temperature of the sample = T_f=17.5^oC=290.65 KT

=17.5

C=290.65K

Change in temperature = \Delta T=(T_f-T_i)ΔT=(T

−T

)

Specific heat capacity of the substance = c

Heat required to raise the temperature of a 894.0g sample = Q

Q = 4.90kJ = 4900 J

Q=m\times c\times \Delta T=m\times c\times (T_f-T_i)Q=m×c×ΔT=m×c×(T

−T

)

4900 J=894.0 g\times c\times (290.65 K-267.35 K)4900J=894.0g×c×(290.65K−267.35K)

c=0.23523 J/g K\approx 0.235 J/g Kc=0.23523J/gK≈0.235J/gK

The chemist will report the specific heat capacity of the substance as 0.235 J/g K.

5 0

3 years ago

Someone drops a book on the floor and it makes a loud noise. At the time you turn and look at the person who dropped the book .

Tcecarenko [31]

Answer: curiosity?

Explanation:

6 0

3 years ago