Ch 4 WS

Which of the following statements regarding atoms, molecules, and moles iscorrect?

A single grain of sand has about as many formula units of SiO2 as there are sand grains on all of the beaches on Earth.

Methyl butyrate is a compound that is partially responsible for the flavor of apples. It consists of 58.80% C, 9.87% H, and 31.33% O. What is the empirical formula of methyl butyrate?

C5H10O2

Which of the following statements isincorrect?

Ca(NO3)2 has six times as many oxygen atoms as calcium ions.

Which of the molecules in the figure have an empirical formula that is different from their molecular formula?

H2O2 and N2O4

Which of the following sets of formulas is correct for the molecules in the figure?

H2SO4, SCl4, C2H4

Which of the following statements isincorrect?

N2O5 has 2.5 times as many nitrogen atoms as oxygen atoms.

Given the following molecular formulas, determine the empirical formula of each compound: N2O5, PCl3, H2O2, C6H4Cl2.

N2O5, PCl3, HO, C3H2Cl

The following minerals contain lead. Rank the minerals in order of percent lead from least to greatest: cottunite, PbCl2; anglesite, PbSO4; andorite, PbAgSb3S6; and galena, PbS.

PbAgSb3S6 < PbSO4 < PbCl2 < PbS

Rank the following in order of increasing mass: 1.0 mole of methane (CH4), 0.50 mole of water (H2O), 0.20 mole of Fe, and 0.010 mole of U.

U < H2O < Fe < CH4

Which of the following statements regarding empirical formulas, molecular formulas, and percent composition is correct?

if the molecular formula of a compound is C6H5Cl, its empirical formula is the same.