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What is the energy in J per mol of photons of waves with wavelength [x] mm?  h= 6.626 x10-34 J s Round your answer to 3 decimal places Notes: Calculate the energy for 1 mole of photons, not just one photon.

Sulfur trioxide (SO3) is produced from the oxidation of SO2 as follows: 2 SO2 + O2  →  2 SO3 What is the percent yield if 18 g of SO3 is isolated from the reaction of  21 g of SO2  and 10 g of O2.

A solution has a pH of  [x]; what is the hydronium ion concentration? Your answer should have at least 3 decimal places.

What is the sulfate ion concentration (M) in a [x] ml solution of [M] M Al2(SO4)3? Your answer should have 2 decimal places.  

If the hydronium ion concentration is 4.3 x 10-8 M, what is the pH of the solution? Your answer should have 2 decimal places.

If the hydronium ion concentration is 7.6 x 10-9 M, what is the pH of the solution? Your answer should have 2 decimal places.

The reaction of F2 with excess Si produces SiF4, silicon tetrafluoride: 2F2 + Si → SiF4  How many moles of silicon tetrafluoride are produced from the reaction of [x] g of fluorine gas? Your answer should have 3 decimal places. 

If the hydronium ion concentration is 3.5 x 10-7 M, what is the pH of the solution? Your answer should have 2 decimal places.

For the following reaction, 0.400 moles of barium hydroxide are allowed to react with 0.376 moles of sulfuric acid .barium hydroxide ( aq ) + sulfuric acid ( aq )  barium sulfate ( s ) + water ( l ) What is the formula of the limiting reagent?

For the following reaction, [x] grams of hydrogen gas are allowed to react with 44.9 grams of iodine .H2 ( g ) + I2 ( s )  2 HI ( g ) What amount of the excess reagent remains after the reaction is complete? Your answer should have 3 decimal places.