Can you determine the molecular formula of a substance from its percent composition

The percent composition gives you only the empirical formula. 
To get the molecular formula, you must either know the molecular mass or do an experiment to find it.

It changes food into energy that the organism can use.

Read the sentences below in 1962, i tried to enroll as the first black student at the university of mississippi. the governor of mississippi blocked my entrance which best describes the verbs used in the sentences? o they are past tense verbs, which are often used in narrative essays o they are past tense verbs, which are not often used in narrative essays. o they are future tense verbs, which are often used in narrative essays o they are future tense verbs, which are not often used in narrative essays.