The mass of a single rice grain is extremely large compared to the mass of a single atom. (a typical hydrogen atom has a mass of 1.66 × 10–24 g—too small to even imagine! ) chemists therefore count atoms in large groups, called moles, where one mole contains 6.02 × 1023 (avogadro’s number) of atoms. let’s define a food-mole as containing 602 particles (rice, beans, peas, etc.) calculate the mass of one food-mole of rice. this is the food-molar mass of rice.

the catch is that the top numbers are atomic masses the bottom numbers are the numbers of protons and electrons in an uncharged atom. they are the number of that atoms as you would find them on the periodic table. further, the numbers on the left are used to determine the missing numbers on the right

so here we go

atomic mass

239 + 1 = y + 134 + 3 combine like terms

240 = y + 137             subtract 137 from both terms

240 - 137 = y

103 = y

atomic number

94 = z +54 + 0

94 = z + 54               subtract 54 from both sides.

40 = z

answer

Hydrogen is the most abundant element on the periodic table..hope it .

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.

The answer is letter c