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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. 

If the hydronium ion concentration is 8.1 x 10-3 M, what is the pH of the solution? Your answer should have 2 decimal places.

An unknown element X ( [y] g/mol) reacts with oxygen to produce its oxide according to this equation: 6X(s) +  3O2(g) →  3X2O(s) Based on this information, what is the amount of oxygen in grams required to completely consume [x] g of the element? Your answer should have at least 1 decimal place.

If the hydronium ion concentration is 4.5 x 10-6 M, what is the pH of the solution? Your answer should have 2 decimal places.

Carbon monoxide is made from the oxidation of carbon:  2C(s) +  O2(g) →  2CO(g) What mass of carbon monoxide (MM 28 g/mol) can be made from the reaction of [x] g C (MM 12 g/mol) with [y] g O2 (MM 32 g/mol)? Your answer should have at least 1 decimal place.

For the following reaction, 19.6 grams of glucose (C6H12O6) are allowed to react with 14.9 grams of oxygen gas.glucose (C6H12O6) ( s ) + oxygen ( g )  carbon dioxide ( g ) + water ( l ) What is the identity of the limiting reagent?  

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

Most earthquakes originate deep below the crust where the pressures are enormous.

What are the two most abundant elements in Earth’s crust?

The current estimate for the age of Earth is about ____ years.