a$.(2)$ For a sample of $0\mathrm{.}1wt\%C$ steel at $728C,$ what phase or phases will be present, and what will be the composition of each phase, in wt$\%$ C $?$

b$.(2)$ For a $1$ kg sample of $0\mathrm{.}8wt\%C$ steel at $728C,$ what will be the mass, in grams, of cementite?

c$.(2)$ For a $1$ kg sample of $2\mathrm{.}1wt\%C$ steel at $728C,$ what will be the mass, in grams, of carbon in cementite?

d$.(2)$ For a $1$ kg sample of $4\mathrm{.}3wt\%C$ cast iron at $1148C,$ what phase or phases will be present, and what will be the composition of each phase, in wt$\%$ C$?$

e$.(2)$ For a sample of $2\mathrm{.}14wt\%C$ steel, what will be the maximum temperature to which this sample could be heated without any liquid forming?

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