What is the mass % of roses in a bunch of flowers that contain: 10 yellow roses, 5 red roses, 15 tulips and 20 red and yellow carnations?

Morphine (C₁₇H₁₉NO₃) is a painkiller in the opiate family. A sample of morphine was discovered that had been diluted by mixing with table salt (sodium chloride). When 2.00 g of the mixture undergoes combustion, 3.97 g of CO₂ is produced. What is the mass percent of morphine in the mixture?

2. A mixture of Na2SO4 and its hydrate Na2SO4-10H₂O has a mass of 1.5099 g. After heating to drive off all the water, the mass is only 1.1410 g. What is the weight percentage of Na2SO4.10H₂O in the original mixture? Report your answer to 4 significant figures. Molar masses: Na2SO4 142.04 g/mol; Na2SO4.10H₂O 322.19 g/mol.

CuSO4•5H2O  what is molar mass g/ml?

Benzene, C6H6, is an important solvent and intermediate chemical in many chemical reactions. It is also toxic and classified as a carcinogen. If the density of benzene is 0.8766 grams per ml, how many moles of benzene would be 755 ml of benzene?

Mg(Bro,)2 H,SO (aq) Provide the formula for the following iron () nitrate hydrosulfuric acid sodium phosphate bromic acid Calculate the molecular weight of a copper sample which consists of 65.1 % "Cu (atomic mass = 52.87 amu) and 34.9 % Cu (atomic mass = 64.86 amu) The concentration of gold in seawater is 0.027 ug/L. What mass of gold (in kg) is present in the Atlantic Ocean, of volume 3.23 x 10" km'?