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dolphi86 [110]
2 years ago
12

Element X consist of two isotopes with masses of 62.9 and 64.9. The relative atomic mass of the element is 63.6. What is th

Chemistry
1 answer:
koban [17]2 years ago
4 0

Answer:

it is 50%

Explanation:

62.9x50=3145

64.9x50=3245

3245+3145=6390

6390/100=63.9

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Give an example of experimental bias
ale4655 [162]

Answer:

chongus because he's the only good one

3 0
3 years ago
Explain how energy is conserved between this reaction and the and surrounding environment C3H8+4O2->3CO2+4H2O+ heat (-2218.6)
alukav5142 [94]

Answer:

The heat of formation = Heat of formation of the products - Heat of formation of the reactants

= -2323 + 104 = -2219 ≈ -2218.6 kJ/mol.

Explanation:

The law of conservation of energy states that the total energy is constant in any process. Energy may change in form or be transferred from one system to another, but the total remains the same

The heat of formation of C₃H₈ is 3C + 4 H₂ → C₃H₈ \Delta H^{\circ}_f  -104 kJ/mol

The heat of formation of O₂ is O₂ (g) → O₂ (g)  \Delta H^{\circ}_f  0 kJ/mol

The heat of formation of H₂O is H₂(g) + 1/2 O₂→ H₂O (g)  \Delta H^{\circ}_f  -286kJ/mol

The heat of formation of CO₂ is C (s) + O₂ (g) → CO₂ (g)  \Delta H^{\circ}_f  -393 kJ/mol

Therefore, in the given  reaction we have;

C₃H₈ + 4 O₂ → 3 CO₂ + 4 H₂O

The heat of formation = Heat of formation of the products - Heat of formation of the reactants

The heat of formation = 3 × (-393) + 4 × (-286) - (-104) = -2219 ≈ -2218.6 kJ/mol.

5 0
3 years ago
1. What is the flame color of sodium?<br> yellow-orange<br> purple<br> green<br> blue-green
juin [17]

Orange is the color of Sodium

4 0
3 years ago
One scientist discovered an accurate way to measure the temperature of planets. When would the scientist's discovery most likely
never [62]

Answer:

When the scientific community retest and accepts the results

Explanation:

Mark me brainlist pls

4 0
2 years ago
A mixture of gaseous reactants is put into a cylinder, where a chemical reaction turns them into gaseous products. The cylinder
Zina [86]

a)Exothermic

b) it goes up

c) The piston must move out

d)The energy is released by the system

e)ΔE = -616 kJ

Explanation:

sign convention for heat flow:

if the heat flows into the system it is marked with positive sign

when the heat flows out the system it is marked with negative sign

sign convention for work

if work is done on the system it is marked positive

if work is done by the system it is marked negative

sign convention for internal energy

if energy absorbed by system mark positive

if energy released by system mark negative

a)

the heat flow flowing out of the system (q= -300 kJ)

thus the reaction is Exothermic

b)

In exothermic reaction, heat flows from the system to surroundings.

surrounding here is water bath.

As the system is exothermic, hence the temperature of water bath goes up

c)

It is given that 316 kJ of work is done by the system, applying expansion.

To maintain constant pressure of 1 atm the decreased pressure can be compensated with an increase on volume . To increase volume the piston must move out

d)

According to 1st law of thermodynamics,

ΔE =q +w            ⇒1

here,

ΔE = q +w  

ΔE =  -300 kJ -316 kJ

ΔE = -616 kJ          ⇒2

the negative sign denotes the energy is released by the system

e)

from ΔE = -616 kJ   the amount of energy released by the reaction is ΔE = -616kJ  

7 0
3 years ago
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