(I can use 2/3 questions if needed)A sample of brass weighing 1.203 grams was analyzed. Brass is an alloy composed of copper, Cu, and zinc,Zn. The zinc in the alloy was reacted with 35.123 grams of hydrochloric acid, HCl, in excess, according tothe following balanced equation: Zn(s) + 2 HCl (aq) → H2 (g) + ZnCl2 (aq) After all of the zinc reacted the mass of the remaining solution weighed 36.309 grams.a) What mass of hydrogen gas was produced?b) What mass of zinc reacted?c) What was the percentage of zinc (by mass) in the alloy?

balance the equations by entering the smallest possible integer coefficients. AgNO3 (aq) +   FeCl3 (aq)   →   AgCl (s) +   Fe(NO3)3 (aq)   KClO4 (s)   →   KCl (s)   +   O2 (g)

Boric acid, H3BO3, is commonly used in eyewash solutions in chemistry laboratories to neutralize bases splashed in the eye: H3BO3 (aq) + 3 NaOH (aq) → 3 H2O (l) + Na3BO3 (aq) A 0.483 M sodium hydroxide solution is used to neutralize a 26.29 mL sample of boric acid. During an experiment, 23.02 mL of sodium hydroxide is required for complete neutralization of the boric acid to a phenolphthalein endpoint. Calculate the number of moles of NaOH used in the reaction. Give only the number

How many grams of AgCl will be formed when 60.0 mL of 0.500 M AgNO₃ is completely reacted according to the balanced chemical reaction: FeCl₃(aq) + 3 AgNO₃(aq) → 3 AgCl(s) + Fe(NO₃)₃(aq)

Predict the reactants of this chemical reaction. That is, fill in the left side of the chemical equation. Be sure the equation you submit is balanced. (You can edit both sides of the equation to balance it, if you need to.) Note: you are writing the molecular, and not the net ionic equation. 0 → KI(aq) +H_O(1) X Ś

In the following reaction, identify the limiting reactant (note the difference in units: Mg(OH)2 (s) + 2 HBr (aq) → MgBr2 (aq) + 2 H2O (l) 25.0 grams   0.75 mL of 1.0 M

To measure the amount of chlorine in a well-boring fluid, an analytical chemist adds 0.180M silver nitrate (AgNO3) 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 2.25 g has been produced. The balanced chemical equation for the reaction is: Cl(aq) + AgNO3(aq) → AgCl(s) + NO3(aq) x10 What kind of reaction is this? O precipitation O acid-base O redox 3 ? If you said this was a precipitation reaction, enter the chemical formula of the precipitate. 0 If you said this was an acid-base reaction, enter the chemical formula of the reactant that is acting as the base. 0 0 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 3 significant digits. % X

Identify each of the following reactions as precipitation, acid-base, oxidation-reduction, or combustion. A) C(s) + O2(g) →  CO2(g) B)  2 HClO4(aq) + Ca(OH)2(aq) →  2 H2O(l) + Ca(ClO4)2(aq) C) Fe(s) + 2 AgNO3(aq) →  2 Ag(s) + Fe(NO3)2(aq) D) MgSO4(aq) + Ba(NO3)2(aq) →  Mg(NO3)2(aq) + BaSO4(s)

The reaction Pb(NO 3) 2( aq) + Li 2SO 4( aq) → PbSO 4( s) + 2 LiNO 3( aq) is best classified as a(n)     oxidation-reduction reaction.     acid-base neutralization reaction.     single replacement reaction.     precipitation reaction.

To measure the amount of calcium carbonate (CaCO3) in a seashell, an analytical chemist crushes a 2.400 g sample of the shell to a fine powder and titrates it to the endpoint with 194. mL of 0.220 M hydrogen chloride (HCl) solution. The balanced chemical equation for the reaction is: 2HCl(aq) + CO3(aq) → H₂CO3(aq) What kind of reaction is this? + 2 CI (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 CaCO3 in the sample. Be sure your answer has the correct number of significant digits. O precipitation O acid-base O redox 0 1 0 0% 8 X x10