A+ b + c → d + e
describe the mass of the reactants and products given the balanced chemical reaction.
a)
the mass of the products is 2/3 that of the reactants.
b)
the mass of the reactants equals the mass of the products.
c)
the mass of the reactants is less than the mass of the products.
d)
the mass of the reactants is greater than the mass of the products.

Consider a file currently consisting of 200 blocks. assume that the file control block (and the index block in the case of indexed allocation) is already in memory. calculate how many disk i/o operations are required for contiguous, linked, and indexed (single-level) allocation strategies, for each of the conditions listed below. in the contiguous-allocation case, assume that there is not room to grow at the beginning but there is room to grow at the end. also assume that the block information to be added is stored in memory.