Chapter 1, Problem 6P

Suppose a certain copolymer elastomeric material “styrene-butadiene rubber”) contains styrene ("S") monomers –(C8H8)– and butadiene ("B") monomers –(C4H6)– and that their numerical ratio S:B = 1:8. What is the mass ratio mS:mB of the two monomers in the material? What is the molecular mass M of a macromolecule of this copolymer with degree of polymerization n = 60,000? Data: AC = 12.01 u, AH = 1.008 u.

Lab Questions from Lab: Gravimetric Determination of Calcium as CaC2O4•H2O What is the purpose of the methyl red indicator? Why does a color change to yellow tell you that the reaction is complete? Why is the precipitate rinsed with ice-cold water in step 4? Why not room temperature or hot water? Why is it important that the funnels be placed in a desiccator before weighing (steps 1 and 5)?

What mass of ethylene glycol, HOCH2CH2OH, Mustbe added to 5.50 kg of water to antifreeze that would work for the car radiator to -10.0 degrees celcius? MM (g/mol): 62.07

What is the molarity of a 0.393 m glucose solution if its density is 1.16 g/mL? MM glucose 180.2 g/mol

The rate constant for the decay of a radioactive element is 2.28 × 10⁻³ day⁻¹. What is the half-life of this element in days?

Handwritten please

Choose the best reagents to complete the following reaction. i H A B 1. CH3CH2Na 2. H3O+ 1. CH3CH2MgBr 2. H3O+ 1. CH3MgBr Q C 2. H3O+ 1. H3O+ D 2. CH3MgBr 00 OH Q E CH³MgBr

The kinetics of a gas phase reaction of the form A → Products results in a rate constant of 0.00781 M/min. For this reaction, the initial concentration of A is 0.501 M. What is the half-life for this reaction?

Choose the best reagents to complete the following reaction. 1. PhNa A 2. H3O+ 1. PhCH2MgBr B 2. H3O+ хё 1. PhMgBr C 2. H3O+ 00 HO Q E D 1. H3O+ 2. PhMgBr PhMgBr