If you use 5.6 g of Al (s) and excess sodium hydroxide, how many liters of H2 (g) at 742 mm Hg and 22.0 ˚C are produced?

If 25.5 g of NaOH is added to 0.550 L of 1.00 M Ni(NO₃)₂, how many grams of Ni(OH)₂ will be formed in the following precipitation reaction? 2 NaOH(aq) + Ni(NO₃)₂(aq) → Ni(OH)₂ (s) + 2 NaNO₃ (aq)

3) In a far away land and long ago, a series of experiments were carried out. Three samples of minerals where collected, and the sample were analyzed, and found to contain two elements kalium and pyron. . They use K for kalium and HO for pyron. Sample..... A (from a mine). . B (from a dry lake).. . .. C (from the foundation of a castle). 0.8729 Mass (g) g of Kalium g of Pyron 0.5236 0.2755 0.2481 0.6918 0.4770 0.2148 0.4592 0.4137 Use the Law of Conservation of Mass to determine if the data is worth using. sample A (froma mine) (g) 0. S236 sample B Cfrom O.6918 (9) o. 2755 + O 248TED Thus every sample has different vawes of the Same element, the mess of each sample is equal to the addifio of itscomponents, wich states that the mess of the procloct matches the mass of the' sample. dry lake) 9) a 0.4770 + 0.2148 Io sample c (frome fondatior ofecosfle O, 8729 0.4592 K+ 0.4137 30 Use the Law of Constant Composition to determine if any of the samples could be the same substance. Use the Law…

To measure the amount of chlorine in a well-boring fluid, an analytical chemist adds 0.390M silver nitrate (AgNO,) solution to a 45.0 g sample of the fluid and collects the solid silver chloride (AgCl) product. When no more AgCl is produced, she filters, washes and weighs it, and finds that 1.8 g has been produced. The balanced chemical equation for the reaction is: Cl(aq) + AgNO, (aq) What kind of reaction is this? AgCl(s) + NO, (aq) If you said this was a precipitation reaction, enter the chemical formula of the precipitate. If you said this was an acid-base reaction, enter the chemical formula of the reactant that is acting as the base. If you said this was a redox reaction, enter the chemical symbol of the element that is oxidized. Calculate the mass percent of Cl in the sample. Be sure your answer has 2 significant digits. precipitation O acid-base O redox 0 0 0 0% 0° 0 0..9 X 5 A