(a) Atoms are very small compared to objects on the macroscopic scale. The radius of a vanadium atom is 131 pm. What is this value in meters and in centimeters? cm (b) The mass of a single vanadium atom is 8.46×10-23 g. Suppose enough V atoms were lined up like beads on a string to span a distance of 44.7 cm ( 18 atoms inches). How many atoms would be required? What mass in grams of V would be used? Could you weigh out this amount of vanadium using a typical laboratory balance? (c) Taking the density of vanadium metal to be 6.08 g/cm³, calculate the mass of metal needed to form a piece of V wire with the same length as the distance in b, but with a diameter of 1.00 mm. Hint: The volume of a cylinder is T times its radius squared times its height. (V = T r² h) How many vanadium atoms does this represent? atoms

A 67.2 gg sample of a gold and palladium alloy contains 3.55×1023 atomsatoms . A) What is the mass percentage of the gold in the alloy? B) What is the mass percentage of the palladium in the alloy?

A 67.2 g sample of a gold and palladium alloy contains 3.33*10^23 atoms.  a) What is the mass % of the gold in the alloy?  b) What is the mass % of the palladium in the alloy?

Two experiments were conducted: 1.2.750 g of copper(II) oxide, CuO2, was reduced by heating at high pressure with excess hydrogen to yield 2.196 g of copper Cu. 2. 1.179 g of copper Cu was dissolved in nitric acid to yield copper(II) nitrate, which was converted to 1.476 g copper(II) oxide, CuO2, on ignition. Show that the results illustrate the law of definite proportions by calculating the percentage of oxygen in copper(II) oxide in experiments 1 and 2. Express your answers numerically to two decimal places, separated by commas. Do not enter the percent symbol. ▾ View Available Hint(s) Percentage of oxygen in sample 1, sample 2 = copper oxide in the sample 15. ΑΣΦ the second experiment S ?

An atom of rhodium (Rh) has a diameter of about2.7 x 10-8 cm. (a) What is the radius of a rhodium atom inangstroms 1A° 2 and in meters (m)? (b) How many Rh atomswould have to be placed side by side to span a distance of6.0 μm? (c) If you assume that the Rh atom is a sphere, whatis the volume in m3 of a single atom?

Element X has two isotopes, 28Q and 30Q. The relative atomic mass of X is 28.24. (a) Define the term "isotope". (b) Calculate the relative abundance of 28Q.

A cube of gold that is 1.00 cm on a side has a mass of 19.3 g.A single gold atom has a mass of 197.0 amu. (a) How manygold atoms are in the cube? (b) From the information given,estimate the diameter in Å of a single gold atom. (c) What assumptionsdid you make in arriving at your answer for part (b)?

What element has 3.63*10^23 atoms in 6.52 g of material?

Although carbon-12 is now used as the standard for atomic weights, this has not always been the case. Early attempts at classification used hydrogen as the standard, with the weight of hydrogen being set equal to 1.0000. Later attempts defined atomic weights using oxygen (with a weight of 16.0000 ). In each instance, the atomic weights of the other elements were defined relative to these masses. (To answer this question, you need more precise data on current atomic weights: H,1.00794 u; O, 15.9994 u.) (a) If H=1.0000 u was used as a standard for atomic weights, what would the atomic weight of oxygen be? What would be the value of Avogadro's number under these circumstances?(b) Assuming the standard is O=16.0000 u, determine the value for the atomic weight of hydrogen and the value of Avogadro's number.

Three samples (A, B, and C) of pure substance composed ofsodium, sulfur, and oxygen were isolated and purified. Elemental analyses showed that sample-A contained 1.62 g sodium, 1.13 g sulfur and 2.25 g oxygen; sample-B contains 1.60 g sodium,2.23 g sulfur, and 1.67 g oxygen; while sample-C contains 1.46 g sodium, 1.02 g sulfur, and 2.03 g oxygen. Determine whether A, B,and Care samples of the same or different compounds.