a) How many grams of MgCl2 are contained in 75 mL of a 5.30-M solution?

31) Convert 35.0 mile/hour to meter/sec.     

21) Which one of the following molecules contain both covalent and ionic bonds?     NaCl                   NH4OH                    CH3OH                   MgCO3       I                          II                           III                          IV  

10) Which response contains all of the following that are oxidation-reduction reactions and no others? I. PCl3(l) + 3H2O(l)  Arrow-Single(8).png 3HCl(aq) + H3PO3(aq)II. Fe2O3(s) + 3CO(g) Arrow-Single(1)(3).png 2Fe(s) + 3CO2(g)III. CaCO3(s) + 2HClO3(aq) Arrow-Single(2)(2).png Ca(ClO3)2(aq) + CO2(g) + H2O(l)

30) What is the identity of a gas if its density is 1.43 g/L at STP?                             .

42) A gaseous sample of a compound has a density of 0.977g/L 0.977 g/L at 710 torr 710.0 torr and 100 0°C. What is the molar mass of this compound?     

43) Ammonia gas can be synthesized by the reaction given below:                  2NO(g)  +  5H2(g)  Arrow-Single(14).png 2NH3(g)  +  2H2O(g) Starting with 86.3g of NO(g) and 25.6g H2(g), find the theoretical yield in grams. 

36) What volume (in mL) of 0.45M NaBr can be prepared from 25g of NaBr? (FW of NaBr = 103g/mol)

4) The formula weight of the compound, Al2(SO4)3.18H2O is:

One of the key risks of Lean systems is the absence of buffers. This risk stems from which of Lean-Operations’ benefits?