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Calculate the density of Helium, He, in grams per liter at 21 degrees C and 752 mmHg. The density of air under these conditions is 1.188 g/L. What is the difference in mass between 1 liter of air...

A vessel containing 39.5 cm3 of helium gas at 25 degrees C and 106kPa was inverted and placed in cold ethanol. As the gas contracted, ethanol was forced into the vessel to maintain the same pressure...

Pb(s)+2 HCl(aq)→PbCl2(s)+H2(g)

And could i have an example of each, please?

I need help with these questions:   1. Use the reaction that occurs when magnesium burns in oxygen to show how a reaction might be included in more than one category of reaction.   2...

Ca(OH)2+H3PO4->Ca3(PO4)2+HOH This one's a bit difficult to figure out. Thanks!

How does cs2 differ from cf4

How does cs2 and cf4 differ in bonding

Can anyone help me with this problem? I can't get the answer, there must be something wrong in my reasoning, thank you so much!   "Calculate the pH of a solution obtained by adding...

The rate of reaction in terms of the "rate law expression" includes the rate constant (k), the concentration of the reactants, and the orders of the reaction with respect to the different...

The rate of the reaction in terms of the "appearance of product" includes the change in the concentration of the product, the time interval, and the coefficient of the product. Consider...

The rate of the reaction in terms of the "disappearance of reactant" includes the change in the concentration of the reactant, the time interval, and the coefficient of the reactant. Consider...

For the reaction A+B+C=>D+E, the initial reaction rate was measured for various initial concentrations of reactants. The following data were collected: Trial A(M) --------B(M)------...

I need some help with my chemistry homework , it asks about electron dot structures

I want to know how to balanced equations

Calculate the molar solubility of a hypothetical metal sulfide, MS, in a solution saturated with H2S at 25C. The pH of the solution is 3.44. Kspa for MS is 1.7 x 10-3.   I know that I...

"Calculate how many cm^3 of a solution of sulfuric acid 80% (density = 1.727 g/mL) must be diluted with water in order to prepare a 0.2 L 0.4 M solution. If we add to this final solution of sulfuric...

Calculate how many cm^3 of a solution of perchloric acid 55.0% ( density = 1.47 g/mL) must be diluted with water in order to prepare a 0.5 L 0.3 M solution. How much water do we have to add in order...

I don't manage to solve this problem, can someone help me?  "Calculate how many cm^3 of a solution of sulfuric acid 80.0% (density = 1.727 g/mL) must be diluted with water in order to...

Which compound below does not involve covalent bonds? (A) C2H6 (B) SF4 (C) O2 (D) Mg3N2   stuck on this question. Please help.