I need help with chemistry please! Thank you so much? - Freemason Hirams Travels Masonic Forums

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03-07-2008, 11:22 PM

hollyberry453

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I need help with chemistry please! Thank you so much?

1) How many hydrogen atoms are in the molecule C5H12?
2) Convert 766 torr to atmospheres (atm).
3) How many atoms of gold are present in 82 nanograms of gold?
4) How many moles are contained in 29.3 grams of ethanol (C2H5OH)?
5) We mix 378 g of SiO<SUB>2</SUB> and 116.8 g of C, the reaction proceeds, and, when it is completed, one of the reactants is left over. How many grams of this reactant remains unreacted?
6) What is the oxidation number of Mn in MnO?
7) How many grams of Co(NO3)2 are needed to prepare 250. mL of a 0.247 M solution?
8) A household ammonia solution is 6.69%. It's density is 0.979 g/mL. What is the molarity?
9) Arrange the following atoms in the order of increasing atomic radii: Li, Na, Rb, Cs, K.

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