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?

18. A silver wire has a diameter of 0.500 mm. What length of this wire contains exactly 1.00 mol of silver ? Given : density of Ag 10.5 g/cm The answer is

A chemist weighed out 101.g of magnesium. Calculate the number of moles of magnesium she weighed out.

Sea salt is formed by natural evaporation of ocean water and contains 98% sodium chloride. The remaining 2% are natural minerals such as iron and sulfur. Consider a 20.0 g sample of sea salt. A) What is the mass of sodium chloride in the sample? B) What is the mass of sodium in the sample? C) What is the mass of Chlorine in the sample?

Calculate the mass, in grams, of 322 atoms of iron, Fe (1 mol of Fe has a mass of 55.85 g). 1 4. 8. +/- 2.