Please help with Chemistry?

I am completely lost on these four questions. Please help!

1)Automotive air bags inflate when sodium azide decomposes explosively to its constituent elements. ( 2 NaN3 -> 2 Na + 3 N2 ). How many moles of N2 are produced by the decomposition of 2.88 mol of sodium azide?

How many liters of N2 are produced at STP?

2)3)Suppose you have a solution that might contain any or all of the following cations: Mn^2+, Ag^+, and Sr^2+ . Addition of HCl causes a precipitate to form. H2SO4 was added to the filtrate and another precipitate was obtained. This is filtered off and NaOH is added to the filtrate. No precipitate is obtained.

a)which ions are present and why?

b)which ions must be absent from the original solution?

3) A 0.0989 g sample of an alcohol is burnt in oxygen to yield 0.2160 g CO2 and 0.1194 g H2O. Calculate the mass percentage of C, H and O in the compound.

4)What happens when an aqueous solution of NiCl2 is added to zinc metal? Write an equation for the reaction and explain your answer.

2 Answers

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  • 9 years ago
    Favorite Answer

    1.

    2 NaN3 → 2 Na + 3 N2

    (2.88 mol NaN3) x (3/2) = 4.32 mol N2

    (4.32 mol N2) x (22.414 L/mol) = 96.8 L N2

  • Anonymous
    4 years ago

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