8. Determine the mass in the units indicated of a) 0.524 moles of gold (Au) in milligrams (mg)

In what units are atomic, molecular, and formula mass expressed? Define those units.

One chocolate chip used in making chocolate chip cookies has a mass of 0.324 g. (a) How many chocolate chips are there in one mole of chocolate chips? (b) If a cookie needs IS chocolate chips, how many cookies can one make with a billionth (1109) of a mole of chocolate chips? (A billionth of a mole is scientifically known as a nanomole.)

Zinc and magnesium metal each reacts with hydrochloric acid to make chloride salts of the respective metals, and hydrogen gas. A 10.00-g mixture of zinc and magnesium produces 0.5171 g of hydrogen gas upon being mixed with an excess of hydrochloric acid. Determine the percent magnesium by mass in the original mixture.

Is the mole a number? Explain.

Considering your answer to Exercise 79, which type of formula, empirical or molecular, can be obtained from elemental analysis that gives percent composition?

How many moles would be in 75.45 g NaCl?  (no units/labels and the number should NOT be written in scientific notation)

The number of particles and amount, respectively, in 45.2 g of potassium nitrate is f. 2.69 x 10^22 particles, 0.0447 mol b. 2.69 x 10^23 particles, 0.447 mol C. 3.20 x 10^23 particles, 0.532 mol d. 3.94 x 10 23 particles, 0.654 mol 3.20 x 10^23 particles, 0.531 mol e.

A student calculated the number of moles of carbon dioxide present in a 100.0 g sample of a gaseous mixture. If the student determined that there is 0.30 mole of carbon dioxide present in the sample, what is the percent composition of carbon dioxide in the sample?

13 Analysis of 1.60 grams of an oxide of iron formed 1.12 grams of iron. a What mass of oxygen was formed during the analysis? b Evaluate the ratio: (number of moles of oxygen atoms) ÷ (number of moles of iron atoms) in the compound. Write the empirical formula for the compound. C