Someone can help me with my chemistry question?

Posted on 2014-12-17 07:16:00 in Chemistry by RAQUEL

Have a final tomorrow and really need someone to show the actual work for the these questions.

1. how many moles of bromine contain 1.51*10^24 molecules of Br2?

2. An unknown gas occupies a volume of 1250 mL at 26 Celsius and 705 torr. If the mass of the gas is 2.37 grams what is the molar mass of the gas?(R=0.0821 atm*L/mol*K)

3. Consider the following reaction:

MnO2(s)+Al(s)>Mn(l)+Al3O3(s)

A. if 25 g of manganese diocide (MW=86.94g/mol) react with 25 g of aluminum what is the mass of manganese produced.

B. what is the mass of excess reactant left over after the reaction?

C. what is the percent composition of the common base NaOH?

D. what is the percentage of water in NiCl2*2H2o?

4. Find the pH of the following solution(Kw=1*10 to the -14)

A. 2.34 * 10 to the -5 M HNO3 solution

B. 2.34 *10 to the -4 M NaOH

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