Total # Posts: 28
We have an aqueous solution that contains 22% (by mass) of a hypothetical solute Z. The formula weight of the solute Z is 215 g/mol. The density of the solution is observed to be 1.1 g/mL. What is the molarity of Z in this solution?
March 28, 2016
What is 0.68 written as a simplified fraction? My answer is 17/25. What makes the statement true? 7^-2= My answer is 14. What is 308,745,538 is scientific notation? My answer is 3.1 x 10^8. What is the solution to (3 x 10^2) x (5 x 10^5)written in scientific notation? My ...
October 13, 2015
A metal bar having a mass of 212 g is heated to 125.0°C and then dropped into 375 g of water at 24°C. After a while the temperature of the water and the metal is 34.2°C. If the specific heat of the metal is 0.831 J/g°C, how much heat did the metal lose?
September 13, 2014
The stopping distance D of a car after the brakes have been applied varies directly as the square of the speed s. A certain car traveling at 70 mi/h can stop in 343 ft. What is the maximum speed it can be traveling if it needs to stop in 160 ft?
February 26, 2013
A 10 kg block sits on a flat surface whose μs=0.60 and whose μk is 0.40 a. What horizontal force is required to get the block move? b.If we continue to apply the same force as in part a. what will the blocks acceleration be?
August 26, 2012
upper atmosphere chloromethane can be decomposed by light according to the reaction:CH3Cl -> CH3(g) + Cl(g)The energy required for this reaction is 428 kJ mol1. If each molecule of chloromethane is decomposed by one photon, what is the maximum wavelength that photon ...
October 26, 2011
The vapor pressure of water at 80 degrees c is 355mmHg. A 100cm3 vessel contained wateraturated oxygen at 80 degrees c., the total gas pressure being 760 mmHg. The contents of the vessel were transferred by pumping to a 50cm3 vessel at the same temperature. What were the ...
October 26, 2011
In an emergency stop to avoid an accident, a shoulder-strap seatbelt holds a 58 passenger in place. If the car was initially traveling at 94 and came to a stop in 5.2 along a straight, level road, what was the magnitude of the average force applied to the passenger by the ...
May 25, 2011
When a horizontal force of 350 is applied to a 86.0 box, the box slides on a level floor, opposed by a force of kinetic friction of 130 .What is the magnitude of the acceleration of the box?
May 25, 2011
the enthalpy of fusion of ice is 6.02 kJ/mol. the heat capacity of liquid water is 75.4 J/molC. What is the smallest number of ice cubes at 0 degrees C each containing one mole of water, necessary to cool 500g of liquid water initially at 20.0 degree C to 0.0 degree C
May 24, 2011
How many grams of FeCl2 should be dissolved in 1 kg of water to make its boiling point equal to 101.56 degrees centrigrade at atmospheric pressure of 1 atm? (Kb=0.52 degrees Celsius/m; solute is completely dissociated). Thanks!! =)
July 18, 2010
I have problems with this question. Can anybody help me? When dilute nitric acid was added to a solution of one of the following chemicals, a gas was evolved. This gas turned a drop of limewater. Ca(OH)2, cloudy,due to the formation of a white precipitate. The chemical was... ...
September 2, 2008