The subject is: Converting between mass and amount (number of moles) and converting between mass and number of atoms and the mole concept. I already know the answers I just need someone to explain (very clearly cause i am not strong in chemistry) how to get the answers. Thanks so much!1.) Calculate the amount of copper (in moles) in a 35.8-g pure copper sheet. Answer: 0.563 mol Cu2.) Calculate the mass (in grams) of 0.473 mole of titanium. Answer: 22.6 g Ti3.) How many carbon atoms are there in a 1.3- carat diamond? Diamonds are a form of pure carbon. (1 carat 0.20 grams) Answer: 1.3 x 10 ^ 22 C atoms4.) Calculate the mass of 2.25 x 10 ^ 22 tungsten atoms. Answer: 6.87 g W5.) A titanium cube contains 2.86 x 10 ^ 23 atoms. What is the edge length of the cube? the density of titanium is 4.50 g/cm^3. Answer: L 1.72 cm6.) Find the number of atoms in a copper rod with a length of 9.85 cm and a radius of 1.05 cm. The density of copper is 8.96 g/cm ^3. Answer:2.90 x 10 ^24 Cu atoms
Let's see if I can clarify this for you, Kelly. #1). Converting from grams to mols: Divide the grams of the Element by its Atomic Mass. The same applies for any Substance, Divide the given amount by the grams/mol of the Substance. Your Example: 35.8g Cu / 63.546 g/mol 0.563 mol Cu. #2). Going from mols to grams: Multiply the number of mols by the Total Atomic Mass, in grams, of the item. Your Example: 0.473mol Ti x 47.90 22.6567, in sigfigs 22.7 g Ti. #3). Converting grams to atoms: Divide total atomic mass in grams by grams/mol of that Element to find number of mols. Then Multiply by Avogadro's Number, 6.022 x 10^23 to obtain the number of atoms. Your Example: (1.3 x 0.20 /12.011)x (6.022 x 10^23) 1.3 x 10^22 atoms. #4). Converting Number of Atoms to to grams: Divide the Number of Atoms given by Avogadro's Number to obtain mols then Multiply by the Element's Atomic Mass: Your Example: (2.25 x 10^22) / (6.022 x 10^23) x 183.85 6.869, or 6.87g W. #5). OOPS! I forgot how to do these last two! Someone will help you on them, I hope.
Catalyst place molecules.genuine e.g. enzymes. Enzymes at their required temperature and Ph point types necessary shape necessary to digest a substance interior the tummy. Examples of enzymes are: Pepsin, amylase, e.t.c answer: the fee decreases. motives: At a extreme temperature, a reaction is greater catalysed. in accordance to Charles' regulation and gay-Lussac's regulation, whilst the variety of debris are consistent, the quantity and tension of an perfect behaving gas is rapidly proportional to its temperature. for this reason, dropping the tension of the gadget to 0.5 atm will impression the reaction fee by its temperature.
