Saccharin, which is used as an artificial sweetener, is made up of 45.90 % by ma

Question

Saccharin, which is used as an artificial sweetener, is made up of 45.90 % by mass C, 2.75% by mass H, 26.20% by mass O, 7.65% by mass N, and 17.50% by mass S. If the molar mass of saccharin is 183.19 g/mol, what is its molecular formula? What is the mass in grams of 5.00 times 10^2 billion titanium atoms? Copper reacts with nitric acid as shown in the balanced chemical equation If you react 25.0 g of copper with an excess of nitric acid and produce 7.24 g of NO, what is the percent yield for the reaction? The amino acid arginine is made up of 41.37 % by mass C, 8.10% by mass H, 32.16% mass N, and 18.37% by mass O. If the molar mass of arginine is approximately 174g/mol, what is its molecular formula/ Consider the unbalanced chemical equation

Explanation / Answer

3Cu + 8HNO3 --> 3Cu(NO3)2 + 2NO + 4H2O

m = 25 g of Cu

m = 7.24 g of NO

a) yield%

MW of Cu = 63.546 g/mol

MW of NO = 30 g /mol

find moles of each

mol of Cu = mass/MW = 25/63.5 = 0.3937 mol of Cu

find thoeretical yeield

3 mol of Cu -->2mol of NO that means 0.3937*(2/3) = 0.2625 mol of NO shoudl be produced in 100%

find actual mol produced

mol NO = 7.24 g / 30 = 0.2413 mol

now... % yield

%yield = real/theoretical * 100% =0.2413 / 0.2625 * 100 = 91.92% is the yield

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