Percentage compostion of carbon in caco3

Ca = 40.08 amu
C = 12.01 amu
O = 16 * 3 = 48 amu

40.08 + 12.01 + 48 = 100.09 total amu

12.01 / 100.09 = 0.1199 * 100 = about 12% C

To find percent composition carbon you do

12.01 amu divided by the total amu of compound times 100..

amu is just the atomic mass number of the element/compound

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.