General Chemistry Answers

What is the difference between pH and pOH?

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Two students Abebe and Eyasu are working on a construction project.They have to calculate the total mass of the mixed cement when sand, cement powder and water are added together

Mass of sand =107.34 kg Mass of water =11.04kg

Mass of cement powder =5.6kg Mass of mixture = ?

Abebe calculate the mass to be 124.0 kg and Eyasus’s calculation gives 123.98kg. Who was write and why ?

1. Two students Abebe and Eyasu are working  on a construction project.They have to calculate the total mass of the  mixed cement when sand, cement powder and water are added together

         Mass of sand   =107.34 kg                            Mass of water =11.04kg

        Mass of cement powder  =5.6kg        Mass of mixture = ?

                  Abebe calculate the mass to be 124.0 kg and  Eyasus’s calculation gives 123.98kg. Who was write  and why ?

The vapour pressure of ethanol (C2H3OH) and 1-propanol (C3H7OH) at 35°C are

100 mmHg and 37.6 mmhg, respectively. Assuming ideal behaviour, calculate the

partial vapour pressures of ethanol and 1-propanol over a solution, in which the

mole fraction of ethanol is 0.3.

The vapour pressure of ethanol (C2H3OH) and 1-propanol (C3H7OH) at 35°C are

100 mmHg and 37.6 mmhg, respectively. Assuming ideal behaviour, calculate the

partial vapour pressures of ethanol and 1-propanol over a solution, in which the

mole fraction of ethanol is 0.3.

A 7.00 L tank at 0.543°C is filled with 8.89 g of dinitrogen diffuoride gas, 9.41 g sulfur tetrafluoride gas and 9.93 g of chlorine

pentafluoride gas. You can assume that the gases behave as ideal gases under these conditions.

A 10 g gold at 18.0 °C is placed in contact with 20 g iron at 55.6 °C. Calculate the final

temperature of the metals in contact. Given the specific heat capacity of gold and iron are

0.129 J g―1C―1 and 0.444 J g―1C―1 respectively.

what is the chemical formula for Activated carbon?

The density at 20 0

C of a 0.500 M solution of acetic acid in water is

1.0042 g/mL. What is the molality of the solution? The molar mass of

acetic acid, CH3CO2H, is 60.05 g/mol.