A 1.19 g sample of an unknown halogen occupies 109 mL at 398 K and 1.41 What is the identity of the halogen? (Hint: use the ideal gas law to find n (mol Then divide mass by mnoles to find molar mass. Then match this molar mass the molar mass of the halogens: F2. Cl2, Br2 and I2) 1) Bromine O 2) Fluorine 3) Chlorine 4) lodine 5) Germanium

4) Ozone, O3, is a product in automobile exhaust by the equation NO2(g) + O2(g) → NO(g) + O3(g). What mass of ozone is predicted to form from the reaction of 2.0 g NO2 in a car's exhaust and excess oxygen? A) 1.8 g O3 B) 1.1 g O3 C) 2.1 g O3

A 2.1880 g sample of a hydrate of Cu(NO3)2 was heated to drive off all of the water of hydration. The remaining solid weighed 1.6986 g. If Cu(NO3)2 X H₂O represents the formula of the hydrate, then what is the value of x? Note: The notation Cu(NO3)2 X H₂O indicates that there are x moles of H₂O for every mole of Cu(NO3)2 in the solid hydrate. Molar masses (in g mol¯¹): H, 1.008 Mg, 24.31 Ni, 58.69 N, 14.01 S, 32.07 Cu, 63.55 O, 16.00 Mn, 54.94 Hg, 200.6

What is the mass in grams of 5.0 x 10 6 molecules of formaldehyde, CH2O?

What is the mass in grams of 1.44 × 10²⁵ molecules of I₂?

the formula for disulfiram decafluoride is S2F10   A.How many molecules are in 1.35 grams of disulfur decafluoride?   B.what is the mass in grams of 1.55 x 10^22 molecules of disulfur decafluoride?

A scientist is trying to discover information about an unknown metal in a compound. The formula for the compound is believed to be XBr, where X is the unknown metal. The scientist determined that a 4.741 g sample of this compound contains 4.812 x 10-2 mol Br. Calculate the atomic mass of the unknown metal, X. atomic mass = amu What is the identity of the metal? Provide the name or symbol of the element. metal:

A student is given a mixture containing two nitrate compounds. The mixture includesNaNO3 and Ca(NO3)2. The mixture is 73.31% NO3 by mass. What is the mass percent of NaNO3 in the mixture?

A scientist is trying to discover information about an unknown metal in a compound. The formula for the compound is believed to be XBr, where X is the unknown metal. The scientist determined that a 4.720 g sample of this compound contains 4.745 x 10-2 mol Br. Calculate the atomic mass of the unknown metal, X. atomic mass = amu What is the identity of the metal? Provide the name or symbol of the element. metal:

10. What is the mass of 3.45 moles of aluminum sulfate [Al2(SO4)3]?