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1 year ago

Which statement correctly distinguishes photosynthesis and respiration?

Chemistry

1 answer:

blondinia [14]1 year ago

4 0

Answer:

photosynthesis uses light as energy source,and cell respiration uses chemical energy

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Calculate the amount of heat released when 27.0 g H2O is cooled from a liquid at 314 K to a solid at 263 K. The melting point of

BlackZzzverrR [31]

Answer : The amount of heat released, 45.89 KJ

Solution :

Process involved in the calculation of heat released :

$(1):H_2O(l)(314K)\rightarrow H_2O(l)(273K)\\\\(2):H_2O(l)(273K)\rightarrow H_2O(s)(273K)\\\\(3):H_2O(s)(273K)\rightarrow H_2O(s)(263K)$

Now we have to calculate the amount of heat released.

$Q=[m\times c_{p,l}\times (T_{final}-T_{initial})]+\Delta H_{fusion}+[m\times c_{p,s}\times (T_{final}-T_{initial})]$

where,

Q = amount of heat released = ?

m = mass of water = 27 g

$c_{p,l}$ = specific heat of liquid water = 4.184 J/gk

$c_{p,s}$ = specific heat of solid water = 2.093 J/gk

$\Delta H_{fusion}$ = enthalpy change for fusion = 40.7 KJ/mole = 40700 J/mole

conversion : $0^oC=273k$

Now put all the given values in the above expression, we get

$Q=[27g\times 4.184J/gK\times (314-273)k]+40700J+[27g\times 2.093J/gK\times (273-263)k]$

$Q=45896.798J=45.89KJ$ (1 KJ = 1000 J)

Therefore, the amount of heat released, 45.89 KJ

7 0

3 years ago

Read 2 more answers

Which law is described by saying that when the pressure of a gas in a sealed container is cut in half, the gas will double in vo

Mamont248 [21]

the answer is boyle's law

8 0

2 years ago

Read 2 more answers

In the balanced equation, 4KO2 + 2CO2 = 2K2CO3 + 3O2 which two chemicals have a molar ratio of 3:4?

Sveta_85 [38]

4KO₂ + 2CO₂ → 2K₂CO₃ + 3 O₂

The two chemicals that have a molar ratio of 3:4 is in equation above O₂ and KO₂

explanation

The molar ratio is the ratio between the amount in moles of two compounds that are involved in a chemical reaction.

In the equation above the mole ratio is determined by examining coefficient ( number in front of the formula)

the coefficient of O₂ is 3 while that of KO₂ is 4 therefore the mole ratio of O₂:KO₂ is 3:4

3 0

3 years ago

Read 2 more answers

Considering that silicon is a metalloid, which of the following statements is true? A. Silicon's ability to conduct electric cur

kobusy [5.1K]

The answer is D. Hope it helps! :)

3 0

3 years ago

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The concentration of a NaOH solution was experimentally determined by dissolving 0.7816 grams KHP (204.2212 grams/mol) in 50.0 m

REY [17]

Answer:

The concentration of the standard NaOH solution is 0.094 moles/L.

Explanation:

In the titration, the equivalence point is defined as the point where the moles of NaOH (the titrant) and KHP (the analyte) are equal:

moles of NaOH = moles of KHP

$[NaOH]xV_{NaOH} = moles of KHP$

$[NaOH] = \frac{moles of KHP}{V_{NaOH}}$

The $V_{NaOH}$ is 40.82mL = 0.04082L and the moles of KHP are

$0.7816g / 204.2212\frac{g}{mol} = 3.827x10^{-3} moles$

Replacing at the first equation:

$[NaOH] = \frac{3.827x10^{-3}moles}{0.04082L} = 0.094 moles/L$

3 0

3 years ago