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3 years ago

Petrol does not catch fire on its own at room temperature. Give Reason

1 answer:

3 0

Because room temperature is below the ignition temperature of petrol. At this temperature energy in the form of heat, flame, or electric spark is needed to start the reaction.

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Water vapor enters a compressor at 35 kpa and 160°c and leaves at 300 kpa with the same specific entropy as at the inlet. What a

Annette [7]

<h3>solution:</h3>

The initial entropy is obtained from the initial pressure and temperature with data from A-6 using interpolation:

s= 8.2652 kJ/kgK

The final temperature is determined from the entropy and the final pressure with data from A-6 using interpolation:

T₂ = T₁+ T₂ - T₁/ 8₂ - 8₁ ( s - s₁)

= (400 + 500 - 400/8.3271 - 8.0347 (8.2652 - 8))

= 478.83°C

The final enthalpy is determined in the same way:

h₂= h₁ + h₂ - h₁/s₂ - s₁ ( s - s₁)

= ( 3275.5+ 3486.6 - 3275.5/ 8.3271 - 8.0347) (8.265)

= 3441.91 kJ/kg

6 0

2 years ago

3. The complex ion Co(H2O)6 2(aq) is pink when placed in solution. Addition of chloride ions creates an equilibrium with CoCl42-

mart [117]

Answer:

See explanation

Explanation:

When the complex ion Co(H2O)6 2+(aq) is placed in solution and chloride ions are added, the following equilobrium is set up;

Co(H2O)62+(aq) + 4 Cl-(aq) <=> CoCl42-(aq) + 6 H2O(g)

Co(H2O)6 2+(aq) solution is pink in colour while CoCl42-(aq) solution is blue in colour.

Since the solubility of CoCl42-(aq) is endothermic, heating the solution will move the equilibrium position towards the right (more CoCl42-(aq) is formed and the solution is blue in colour).

When the solution is cooled, more Co(H2O)62+(aq) is formed and the equilibrium position shifts towards the left and the solution becomes pink in colour.

6 0

3 years ago

He image shows the representation of an unknown element in the periodic table.

alexandr402 [8]

Answer:

the number of neutrons in an atom of the element is 10.

Explanation:

neutron: mass # -protons

neutron: 19 (18.9984 (rounded)) - 9

neutron: 19- 9 =10

whole number is equal to the number of protons.

8 0

3 years ago

Read 2 more answers

How many seconds are in the month of may? (May has 31 days)

creativ13 [48]

Answer:

92,565,504,000 seconds in 31 days

Explanation:

multiply the days by 24 hours

31 * 24= 744

multiply the hours in 1440 minutes

1071360 minutes

now multiply that by 86400 seconds

92,565,504,000 seconds in 31 days

3 0

3 years ago

Read 2 more answers

The first question is "how many moles of carbon monoxide (co) are required to react completely with 1.75 moles of iron (iii) oxi

Stells [14]

According to your equation, for every mole of iron oxide (Fe2O3), it takes 3 moles of carbon monoxide (CO). So for 1.75 moles, it takes 3 times as many moles of CO.

1.75 x 3 = 5.25 moles of CO.

I think your product is CO2. Dalton's Law sayeth that the coefficients tell us the ratios of moles. So if you hve 1.75 moles of Fe(III)oxide, 3*1.75 moles of CO are needed (in theory) to react completely. The answer is requested in moles, so you need go no further.

6 0

3 years ago

Read 2 more answers