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CO2(g) + 4H2(g) —-> CH2(g) + 2H20(l)
Unknown element chemical formula

An unkown element X forms a compound with chlorine: XCL2. Predict the chemical formula of the compound that element X makes with oxygen. Justify your answer.
What is the pOH of .000135 M HBr?

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)9.45 g of liquid hexane (C6H14) is introduced into a 10.0 L vessel containing 13.15 atm of oxygen gas at 21ºC and ignited, yielding carbon dioxide and water. If the vessel is then cooled to –10ºC, what will be the gas pressure inside the vessel?

i just found the O2 and 

The formula of sodium trioxocarbonate

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Water is added to 0.75 L of a 6.0 M KOH solution to make 2.0 L of a diluted KOH solution.

Water is added to 0.75 LL of a 6.0 MM KOHKOH solution to make 2.0 LL of a diluted KOHKOH solution.
how to find the balanced equation of calcium chloride dehydrate and potassium hydroxide

how do you find the balanced equation, theoretical yield, and percent yield of calcium chloride dehydrate and potassium hydroxide?

 
Calculate the acetate ion concentration in a solution prepared by dissolving 1.70×10-3 mol of HCl(g) in 1.00 L of 6.00×10-1 M aqueous acetic acid (Ka = 1.80×10-5).

calculate the pH
2 Al +3 Br2 → 2 AlBr3 If 25.0 g of Al and 100.0 g of Br2 are reacted, and 64.2 g of AlBr3 product are recovered, what is the percent yield for the reaction?

2 Al +3 Br2

In an experiment, 0.300 g of a vapourised liquid was found to have a volume of 84.0 cm3 at 97°C and at a pressure of 105 kPa. Calculate the relative molecular mass of the vapour.
  1. In an experiment, 0.300 g of a vapourised liquid was found to have a volume of 84.0 cm3 at 97∞C and at a pressure of 105 kPa. Calculate the relative molecular mass of the vapour.