What is the result, reported to the proper number of significant figures, of the indicated arithmetic operations on the experimental measurements shown below? 17392.3092.210.005200.0050.00520.005202 Question 3 Which compound contains both a halogen and a noble gas? MgO KCl XeF6 Ca(OH)2 CO2 A.6.00-g sample contains 1.28g of impurity. The rest of the sample is sodium phosphate. What is the percent by mass of sodium in the initial sample? Assume the impurity contains no sodium. 421% 787% 33.1% 21.3% How many chloride ions are there in 1.38g of calcium chloride? 7.491021 1.501022 3.741021 2.501021 What is the correct formula of the compound composed of the alkaline metal in Reriod 4 and the element in Group 5A and Period 2? CaP Caj3P2 KN Ca2P3 K3N KN3 If 0.50 mole C6H16O4 is completely decomposed into its constituent elements, carbon, hydrogen, and oxygen, how many moles of hydrogen gas (H2) would be produced? (Hint: write a balanced chemical equation first.) 4.0mol 8.0mol 16mol 0.50mol