What is the mass of 2.21 moles of phosphorus trichloride?.How many moles of Zn (mixed with excess HCl) are required to form 0.50 g H 2 if the yield is 20%?.If 10 g Zn are mixed with 0.10 mole of HCl and the reaction goes to completion, how many grams of H 2 will be formed?.What is the weight of one molecule of the compound?.
The compound has a molecular weight of 64. A compound contains 40.0 % carbon, 6.7 % hydrogen, and 53.3 % oxygen. If you could take one pound of aluminum and divide it into samples that contained one billion atoms each, how many samples would you have?. How many atoms are there in 1.0 mL of mercury (density = 13.5 g/mL)?. Calculate the atomic weight of the element. Naturally-ocurring boron consists of two isotopes. Suppose that Dalton had proposed that all atoms have the same size, weight, and other characteristics. Mercury has a density of 13.5 g/mL Determine the number of moles of mercury in 1.0 L of mercury. How many aluminum atoms can be placed in a straight line 1.0 feet in length? An aluminum atom has a diameter of about 3 Å (an Angstrom is 10 -8 cm). Give the name, correctly spelled, of each of the following elements:. Give the name of the elements with the following symbols:. What is the total weight of Birn seeds consumed by one Schafkin in one week?. How many factories must there be in order to feed all of the Schafkins? The planet has a population of 3.23 x 10 9 Schafkins. How many Schafkins will this production feed each week (the Schaf week contains 10 days)? A tat factory produces 1.68 x 10 8 tats per week. What is the weight of a 15 tat meal in grams and in pounds? The average Schafkin eats 15 tats at each of 5 meals per day. The prodigious appetites of the Schafkins require that they eat several thousand seeds per day and therefore the seeds are packaged in units of 1000. The occupants of the planet Schaf eat the tiny, amazingly uniform seeds of the Birn tree. How much space is required to store 1.0 ton of paper (express the answer in ft 3)? A paper factory produces 10.0 tons of paper a day. An office uses 6.0 x 10 6 sheets of paper per year. What is the weight expressed in pounds of one ream of paper?. For a certain quality paper the average weight of one sheet is 9.22 g. A ream of paper is 500 sheets of paper. What is the weight of a grain in pounds?. What is the weight of a grain in grams?. 
Consider the following mass equivalencies:ġ gram = 15.4 grains, 1 gram = 0.035 oz, 1 pound = 453.6 grams.Express the length of a 1.8 Å bond (an Angstrom is 1 x 10 -8 cm) in picometers.Express 1.56 x 10 12 kilojoules in gigajoules.Express the weight of 1.00 ton of iron in kilograms.Express the length of a wire that is 1.3 x 10 -3 cm long in nanometers.For example, a microliter is 1 x 10 -6 liters.ġ0 12 tetra T, 10 9 giga G, 10 6 mega M, 10 3 kilo k, 10 2 hecto h, 10 1 deka da, 10 -1 deci d, 10 -2 centi c, 10 -3 milli m, 10 -6 micro m, 10 -9 nano n, 10 -12 pico p, 10 -15 femto f The following lists the prefixes that are used in the metric system to describe the magnitude of a quantity.
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