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We’re being asked to determine the density of osmium (Os) given that an osmium sphere containing 1.2989 × 1027 atoms has a radius of 0.755 cm.
Recall that density is the ratio of the mass and volume of an object:
Also, the volume of a sphere is given by:
where r = radius.
An osmium sphere contains 1.289 x 10 23 osmium atoms and has a radius 0.755 cm. The molar mass of osmium is 190.23 g•mol-1. What is the density of osmium? Recall that the volume of a sphere is given by the formula: 4/3 π r 3
a. 22.6 g/cm 3
b. 6.24 g/cm 3
c. 1.80 g/cm 3
d. 0.822 g/cm 3
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