I have a few questions from my homework and I was wondering if I can get some help

1. In the chemical reaction between aqueous magnesium chloride and sodium metal, how many mol of magnesium metal can be precipitated with 12.6 mol of sodium metal? MgCl2(aq) + 2Na(s) --> 2NaCl(aq) + Mg(s)

2. A student correctly balanced the following chemical reaction, but forgot to include states of matter. What mass of solid precipitate can be expected to form if 23.08 g of silver nitrate is reacted with excess sodium carbonate? 2AgNO3 + Na2CO3 --> 2NaNO3 + Ag2CO3

3. When ammonia decomposes, it breaks down into nitrogen gas and hyrdogen gas. What mass of ammonia is needed to produce 50.00 g of hydrogen gas?

Just a bit stuck, thanks a ton.

A100 kmol/h stream that is 97 mole% carbon tetrachloride (ccl4) and 3% carbon disulfide (cs2) is to be recovered from the bottom of a distillation column. the feed to the column is 16 mole% cs2 and 84% ccl4, and 2% of the ccl4 entering the column is contained in the overhead stream leaving the top of the column. calculate the mass and mole fractions of ccl4 in the overhead stream, and determine the molar flow rates of ccl4 and cs2 in the overhead and feed streams. 12. mw_ccla- 153.82; mw_cs2-76.14.

Amines are good nucleophiles, even though they are neutral molecules. how would the rate of an sn2 reaction between an amine and an alkyl halide be affected if the polarity of the solvent is increased? amines are good nucleophiles, even though they are neutral molecules. how would the rate of an reaction between an amine and an alkyl halide be affected if the polarity of the solvent is increased? because both reactants in the rate-limiting step are neutral, the reaction will be faster if the polarity of the solvent is increased. because both reactants in the rate-limiting step are neutral, the reaction will be slower if the polarity of the solvent is increased. because both reactants in the rate-limiting step are neutral, the reaction will occur at the same rate if the polarity of the solvent is increased. request answer

Predict the relative bond lengths of the three carbon-oxygen bonds in the carbonate ion (co2−3). what would you expect the charge to be on each oxygen? match the words in the left column to the appropriate blanks in the sentences on the right. make certain each sentence is complete before submitting your answer.