The label on a tub of margarine states that 100 g of the margarine contains 0·70 g of sodium. the sodium is present as sodium chloride. calculate the mass of sodium chloride, in grams, present in a 10 g portion of the margarine. the mass of one mole of sodium chloride, nacl, is 58·5 g.

This problem requires three conversions: 1) mass of margarine to mass of sodium, 2) mass of sodium to moles of sodium, and finally 3) moles of sodium to grams of sodium chloride (since moles of Na = moles of NaCl).

1) mass of Na = 10g marg • (0.70g Na / 100g marg)

2) moles of Na = mass of Na • (1 mol Na / 22.99g Na)

3) mass of NaCl = moles of Na • (58.5g NaCl / 1 mol NaCl)

Combining all three steps:

mass of NaCl = 10g • (0.70g / 100g) • (1 mol / 22.99g) • (58.5g / 1 mol) = 0.18g NaCl

If we check the units, we find that our final answer should be in units of grams, which it is.

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.