One atom of an element weighs 1.79 × 10–22 g. What is the atomic mass of this element in atomic mass units?

Which of the following combinations of names and formulas is incorrect?

Calculate the mass in grams of 8.35 x 1022 molecules of CBr4.

If biological species are defined in terms of reproductive compatibility, the formation of a new species hinges on ________. A) gene flow B) reproductive isolation C) hybrid formation D) gene pool expansion

Balance the following equation for the combustion of benzene: C6H6(l) + O2(g) → H2O(g) + CO2(g) What coefficient was placed in front of carbon dioxide?

How many centimeters are there in 57.0 in? (1in = 2.54 cm)

That whales have pelvic bones is taken as evidence that A) they probably evolved from fish. B) ancestral whales had legs. C) whales should have legs. D) having a pelvis is advantageous. E) whales did not evolve by natural selection

How many moles of NaCl are in 135 g NaCl?

A compound containing only carbon, hydrogen, and oxygen is subjected to elemental analysis.  Upon complete combustion, a 0.7916-g sample of the compound produced 1.581 g of CO2 and 0.6474 g of H2O.  What is the empirical formula of a compound?

What is true of natural selection? A) Natural selection is a random process. B) Natural selection creates beneficial mutations. C) The only way to eliminate harmful mutations is through natural selection. D) Mutations occur at random; natural selection can preserve and distribute beneficial mutations. E) Mutations occur when directed by the good of the species; natural selection edits out harmful mutations and causes populations to adapt to the beneficial mutations.