maheshkatariya2000

How many kmol of ethanol are in a 5000kg solution where
𝑤𝑒 = 0.95?
• How many kmol of ethanol are in a 5000kg solution where
𝑥𝑒 = 0.95 (and the rest is water)?

The rate of a certain reaction is given by the following rate law:

rate=k[H2][I2]

The rate of the reaction is measured to be 9.0 x 103 M / s when [H2] = 1.7 M and [I2] = 1.9 M. Calculate the value of the rate constant.

Round your answer to 2 significant digits.

If the annual increase in the population be 20% and the present population be 10,000. What will be the population after 3 years hence?

a.16000

b.17280

c.14400

d.17820

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A chemist carefully measures the amount of heat needed to raise the temperature of a 561.0mg sample of a pure substance from 56.2°C to 67.1°C . The experiment shows that 25.6J of heat are needed. What can the chemist report for the specific heat capacity of the substance? Round your answer to 3 significant digits.

A chemist carefully measures the amount of heat needed to raise the temperature of a 895.0g sample of a pure substance from 6.1°C to 17.2°C . The experiment shows that 24.2kJ of heat are needed. What can the chemist report for the specific heat capacity of the substance? Round your answer to 3 significant digits.

A 37.0g sample of polyisoprene, which has a specific heat capacity of 1.880 J·g−1°C−1, is dropped into an insulated container containing 150.0g of water at 55.0°C and a constant pressure of 1 atm. The initial temperature of the polyisoprene is 5.2°C.

Assuming no heat is absorbed from or by the container, or the surroundings, calculate the equilibrium temperature of the water.

Be sure your answer has 3 significant digits.