At STP, a 7.49-gram sample of an element has a volume of 1.65 cubic centimeters. The sample is most likely (1) Ta (3) Te (2) Tc (4) Ti
How do you get the answer?
The answer is Ti, whoever anonymous is was wrong (and maybe me get my homework too!).
I would calculate the density (density = mass/volume) and compare to the density of the four possibilities.
thanks!
thanks Liliana! and everyone else.
To determine the answer, we need to know the molar mass of each element and use the equation:
Density = mass/volume
First, we need to convert the mass from grams to kilograms:
Mass = 7.49 grams = 0.00749 kg
Next, we calculate the density using the given volume:
Density = Mass/Volume = 0.00749 kg/1.65 cm³
Now, we can compare this density to the known densities of the elements listed in the answer choices to find the most likely element.
1) Ta (Tantalum) has a density of 16.6 g/cm³ = 16600 kg/m³
2) Tc (Technetium) has a density of 11 g/cm³ = 11000 kg/m³
3) Te (Tellurium) has a density of 6.24 g/cm³ = 6240 kg/m³
4) Ti (Titanium) has a density of 4.51 g/cm³ = 4510 kg/m³
To convert the density of each element from g/cm³ to kg/m³, we multiply by 1000.
Comparing the density calculated from the given data (0.00749 kg/1.65 cm³) to the densities of the listed elements, we find that the closest match is Tellurium (Te) with a density of 6240 kg/m³. Therefore, the answer is (3) Te.