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General Chemistry Answers

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A 9.87-mol sample of Zr represents how many atoms?
1. How many grams of calcium hydride are needed to form 4.500 g of hydrogen gas?
Express your answer using four significant figures.

2. 1.22 g H2 is allowed to react with 10.4 g N2, producing 1.24 g NH3.
What is the theoretical yield in grams for this reaction under the given conditions?
Express your answer to three significant figures and include the appropriate units.

3. What is the percent yield for this reaction under the given conditions?
Express your answer to three significant figures and include the appropriate units.

4. How many grams of NH3 can be produced from 3.15 mol of N2 and excess H2.
Express your answer numerically in grams.

5. How many grams of H2 are needed to produce 12.34 g of NH3?
Express your answer numerically in grams.

6. How many molecules (not moles) of NH3 are produced from 6.66×10−4 g of H2?
Express your answer numerically as the number of molecules.
The energy of a particular color of visible light is 4.113x10^-19. What is the wavelength of this light?
63.9 ml of 0.560 M sulfuric acid solution was completely neutralized by 28.3 ml of potassium hydroxide solution. What was the concentration of the potassium hydroxide?
Is it True of Wrong ?


Oxidation with Cu(OH)2 is characteristic for aldehydes.

Thanks
Calcium has_____ electrons in the outer layer which can be easily ________ in chemical reation. Ca is a _________ and Ca(OH)2 has ________ Properties.
1. The activity series of metals arranges all metals in order of their_____ chemical activity. A chemical reaction between a metal and a solution of a salt takes place if the salt solution contains ions of elements which are ____ the metal in the activity series of metals. With diluted acids can react those metals which are _____ hydrogen in activity series of metals. The reaction between silver and diluted nitric acid is not possible, because silver is ______ hydrogen in activity series of metals.
2. The main sources of hydrocarbons are ______ and ______. Natural gas consists of alkanes with less than five carbons. Petroleum contains hundreds of differeent _________ mostly alkanes, but also _______ compound are present. Various compoents of petroleum are obtained by physical methods like________ and are used as lubrication oils and greases. Natural gas and petroleum are crucially important to our civilization.
Thanks in advance.
Gallium arsenide (GaAs) is an important compound to the electronics industry. It is produced in the following reaction between arsine (AsH3) and trimethyl gallium (Ga(CH3)3) :
AsH3 (g) + Ga(CH3)3 (g) --> GaAs (s) + 3 CH4 (g)
If this reaction is initiated at 750C between 1.00 atm of Ga(CH3)3 and 1.00 atm of AsH3 in a rigid 1L vessel, and 1.00 x 10–5 mol of AsH3 is left to dispose of at the end of the reaction, what is the equilibrium constant, KP?
What is the pH of a solution of HCl in which
[H+] = 0.043 M?
A process should have produced 80 grams of a product but actually only produces 43 grams what is the efficiency of the process??