buprofen is an anti-inflammatory with the formula C13H18O2 A. What is the molar mass of ibuprofen? Express your answer using four significant figures. B. How many grams of ibuprofen are in 0.505 mole? Express your answer using three significant figures. C. How many moles of carbon are in 12.5 g of ibuprofen? Express your answer using three significant figures.

A mothball, composed of naphthalene (C10 H8 ), has a mass of 1.50 g . Part A How many naphthalene molecules does it contain? Express your answer in molecules to three significant figures. C10 H3 molecules

Convert 23g of NazN to moles. O 0.28 moles 0.088 moles 1900 moles O 1.8 moles

How many molecules of C8H18C8H18 would you have if you have 2.51 mol? Report your answer with 3 significant figures and in scientific notation. Use * for the multiplication symbol

A sample of a compound has a total mass of 200.0 g. Phosphorus comprises 87.28 g of the sample while oxygen comprises 112.72 g. a. Find the percent mass of phosphorus and oxygen in the sample.b. Find the empirical formula of the compound. c. If the compound has a molar mass of 283.88 g/mol, what is the molecular formula?

What is the empirical formula of an compound containing 81.8% C; 18.2% H.   C H Mass of element (in g) (assuming 100 g of compound) 1._81.8_ 2._18.2_ Moles of element 3.______ 4.______ Moles of element/Smallest moles 5.______ 6.______ Multiplier 7.______ 7.______ Empirical formula C3H8

The fictitious element concordium (Cn) has two naturally occurring isotopes: 65Cn (64.8913 u) and 69C (68.9385 u). The atomic mass of concordium is 66.91 u. What is the percentage abundance of 65Cn? Select one: O A. 50.12 % B. 34.11 % C. 41.37 % D. 65.89 % O E. 49.88 %

Which contains the most moles of carbon? A. 23.9 grams of Co2 B. 9.4 grams of C3H4 C. 71.016 grams of C2Cl6

A sample of bromine has a mass of 40.8 grams. a. How many Br atoms are there in the sample? atoms b. How many Br2 molecules are there in the sample? molecules Submit Answer Retry Entire Group 9 more group attempts remaining a. What is the mass of 1.74 x 1024 atoms of oxygen? grams b. What is the mass of 3.02 x 1023 molecules of oxygen? grams grams values if needed for this question. a. What is the mass of 1.46 x 1024 atoms of iodine? grams b. What is the mass of 1.88 x 1024 molecules of iodine? vay Me Reierences to access important values if needed for this question. a. What is the mass in grams of 1 zinc atom? grams b. The number of atoms in 60.9 grams of zinc would be Avogadro's number.

1A. You have 33.5g MnO3. How many molecules do you have?1B. You have 4.6x1024 molecules O2. How many grams do you have?1C. You have 6.54x1022 molecules Fe2O3. How many grams do you have?1D. You have 43.2g of Cobalt. How many atoms do you have?