All categories

3 years ago

What is the percent composition of K2O?

Chemistry

2 answers:

AlladinOne [14]3 years ago

7 0

Element Symbol Mass Percent
Oxygen O 16.985%
Potassium K 83.015%

Strike441 [17]3 years ago

3 0

Oxygen O 16.985%
Potassium K 83.015%

You might be interested in

Ideal gas (n 2.388 moles) is heated at constant volume from T1 299.5 K to final temperature T2 369.5 K. Calculate the work and h

bija089 [108]

Answer : The work, heat during the process and the change of entropy of the gas are, 0 J, 3333.003 J and -10 J respectively.

Explanation :

(a) At constant volume condition the entropy change of the gas is:

$\Delta S=-n\times C_v\ln \frac{T_2}{T_1}$

We know that,

The relation between the $C_p\text{ and }C_v$ for an ideal gas are :

$C_p-C_v=R$

As we are given :

$C_p=28.253J/K.mole$

$28.253J/K.mole-C_v=8.314J/K.mole$

$C_v=19.939J/K.mole$

Now we have to calculate the entropy change of the gas.

$\Delta S=-n\times C_v\ln \frac{T_2}{T_1}$

$\Delta S=-2.388\times 19.939J/K.mole\ln \frac{369.5K}{299.5K}=-10J$

(b) As we know that, the work done for isochoric (constant volume) is equal to zero. $(w=-pdV)$

(C) Heat during the process will be,

$q=n\times C_v\times (T_2-T_1)=2.388mole\times 19.939J/K.mole\times (369.5-299.5)K= 3333.003J$

Therefore, the work, heat during the process and the change of entropy of the gas are, 0 J, 3333.003 J and -10 J respectively.

7 0

3 years ago

What 2 instruments are commonly used to measure air pressure?

levacccp [35]

I think it is the barometer and aneroid barometer

8 0

3 years ago

Calculate the cost of gasoline for a 320 mile trip from Boston to New

Talja [164]

The cost of gasoline for the trip would cost $57.28 because you first divide 320 by 20 which gives you 16 than after that you do 16 multiplied by 3.58 which gives you $57.28 as your final product

5 0

3 years ago

The maximum number of orbits in an atoms is____. A) 3 B) 5 C) 7 D) 9

Mashcka [7]

The answer///////////b, 5 orbits

5 0

3 years ago

Read 2 more answers

What is the number of moles of chemical units represented by 9.03x10^24? And how do I show work? (DUMB IT DOWN PLEASE)

Goryan [66]

You have to use avagados number... so toy take your starting number and multiple by 1/avagados number which is like 6.002^23 and that will equal your number of males... avagado always associates with moles... look up that exact number though bc I cant remember it

6 0

2 years ago