What tool can you use to check your writing for proper spelling, grammar, punctuation and capitalization?

How does including this excerpt at the beginning of the essay contribute to his argument post

Robert was not waiting for her in the little parlor. he was nowhere at hand. the house was empty. but he had scrawled on a piece of paper that lay in the lamplight: "i love you. good-by—because i love you." what significant idea, presented throughout the novel, does robert's final departure and note highlight? edna is ultimately alone in her rebirth. edna needs to find solace in her children. edna will never be truly loved by anyone. edna should not have forsaken her family.

Phosgene is a chemical agent that is formed by decomposition of chlorinated hydrocarbon solvents by ultraviolet radiation.