Calculate the mass in grams for each of the following gases at STP. 1) 2.87 L of hydrogen chloride, HCl Express your answer to three significant figures and include the appropriate units.   2) 4.78×1022 molecules of dinitrogen pentoxide, N2O5   Express your answer with the appropriate units.

Calculate the volumes of ammonia and oxygen required to produce 28 moles of nitrogen dioxide. 4NH3(g)+7O2(g)→4NO2(g)+6H2O(l)

Determine the percent by mass of water in CuCl2 · 2 H2 O to 3 significant figures. Water %

Type your answers in all of the blanks and submit Solve the ideal gas equation for both molarmass(MM) and density. Let's do this in a series of steps. First think about the equation for molar mass (MM = m/mol) and isolate the moles. Type your answer here Type your answer here n3= Now plug the equation for moles into the ideal gas law (PV = nRT). Type your answer here Type your answer here PV = Now rearrange this equation to isolate the molar mass (MM). 13 M = Type your answer here Type your answer here And finally, rearrange the equation and isolate the variables for density. Remember that density = m/V. E Fur d = Type your answer here Type your answer here

solid mercury (II) oxide decomposes when heated forming liquid mercury and oxygen gas as the only products. What mass of mercury (II) oxide must be decomposed in order to collect 843. mL of oxygen gas under STP conditions.

How many moles of NO₂ would be required to produce 2.23 moles of HNO₃ in the presence of excess water in the following chemical reaction? 3 NO₂(g) + H₂O (l) → 2 HNO₃(g) + NO(g). Round to right amount of sig figs.

4NH3+5O2=4NO+6H2O how much water is produced?in grams

How many water molecules are in a block of ice containing 1.00 molmol of water (H2OH2O)?

2. Sodium nitrate decomposes into sodium nitrite and oxygen gas with heat. When 0.123 g of sodium nitrate was heated, it produced 16.2 mL of oxygen collected over water. The room temperature and pressure are 22.5°C and 758 torr, respectively. The water over which the gas was collected had a temperature of 20.0°C. Calculate the theoretical amount of oxygen in grams which should have been produced. What is the percent yield? Theoretical yield oxygen: Actual yield oxygen: bg Percent yield: