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a toothpaste contains 0.24% by mass sodium fluoride to prevent dental cavaties. One tube contains 119g of toothpaste. How many moles of NaF are in the tube of toothpaste.
The amount of boiling water required to raise the temperature of 25 kg of water in the bath to body temperature is 4.8 kg. In this process, the heat lost by the boiling water is equal to the heat gained by the room-temperature water.
4Al + 3O2 = 2Al2O3 determine the percent yield if 124 g Al2O3 are produced when 3.0 moles of Al are reacted
A chemical firm was hired to monitor a nearby lake for possible mercury contamination. Several samples were taken at different locations around the lake, including water samples.
Describe two independent methods for determining the atomic mass of an element. Explain how these method are truly independent.
One method of estimating the temperature of the center of the sun is based on the assumption that the center consists of gases that have an average molar mass of 2.00 g/mol.
Determine the longest wavelenght of light required to remove an electron from a sample of potassium metal, if the binding energy for an electron in K is 1.76*10^3 kJ/mol.
A 125.0g sample of copper is initially at 25.0oC. It absorbs 12.50 kJ heat from its surroundings. What is the final temperature to the nearest tenth degree? Specific heat copper = 0.3874 J/goC.
estimate the enthalpy change for the combustion of hydrogen gas in the presence of oxygen gas.
Suppose that you developed your own new temperature scale, denoted oN. You chose 30.0oN as the temperature of freezing water and 280oN as the temperature of boiling water at 1.0 atm pressure.
In a second experiment, I(electric current) broke down a sample of H 2 O into 1.45 grams of hydrogen and 11.51 grams oxygen. Are these results reliable with the law of exact extent?
Which of these is a coefficient in this chemical reaction? P4s(s)+5o2(G) p4o10(S)
Based on the following chemical equation 2C6H6 + 15O2 12CO2 + 6H2O calculate the number of moles of CO2 that will be produced
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