Answer all the following questions correctly and please show your work!

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Calculate the mass of a star having a diameter of 5E5 km and an average density of 1.3 g/cm3. Enter the correct numeric value to 2.0% precision. Express scientific notation like 4.295-15 kg Grade This Exercise Gold can be hammered into decorative gold leaf, which is only 1.00E-07 m thick. If 1.95 troy ounce of gold is hammered into gold leaf, what is the area that can be covered when used for decoration? 1 troy ounce = 31.1 g, and the density of gold is 19.3 g/cm3. Enter the correct numeric value with the appropriate number of significant figures. Express scientific notation like 4.29E-15 m? Grade This Exercise Granulated sugar (sucrose, C12H22011) has an average density of about 0.72 g/cm. Calculate the molarity of sucrose if 3.0 tsp of sugar is added to a 16 oz cup of coffee. 1.00 tsp = 4.93 cm Enter the correct numeric value with the appropriate number of significant figures. Express scientific notation like 4.35-15 M Grade This Exercise The U.S. Environmental Protection Agency set a maximum contaminant level (MCL) for tetrachloroethylene (TCE, CzCla) in drinking water of 0.005 ppm (by mass). If the water in your home contains 6.00 percent of the allowable MCI, what is the molarity of TCE in your home? Enter the correct numeric value with the appropriate number of significant figures. Express scientific notation like 4.295-15 M Grade This Exercise White sand is made of silica (silicon dioxide, or SiO2), which has a density of 2.20 g/cm. How many silicon atoms are in a spherical grain of sand 0.134 mm in diameter? Enter the correct numeric value with the appropriate number of significant figures. Express scientific notation like 4.295-15 Si atoms Grade This Exercise