Chemistry Answers

In the following reaction equilibrium, NO + O2 ↔ NO2 + 29.1 kcal, state the effect upon the equilibrium of each of the following changes

Colocamos una varilla de metal que pesa 5.00 g con una capacidad calorífica específica de 0.490 J / K / g en 23,5 mL de agua. La capacidad calorífica específica del agua es 4.184 J / K / gy hacemos la aproximación de que su densidad es exactamente 1.000 g / mL. El agua tiene una temperatura inicial de 20.0 ° C y la varilla de metal tiene una temperatura inicial de 81.0 ° C. ¿Cuál es la temperatura final (en oC) del agua y la varilla de metal? La capacidad calorífica específica del agua es 4.184 J / K / gy hacemos la aproximación de que su densidad es exactamente 1.000 g / mL. El agua tiene una temperatura inicial de 20.0 ° C y la varilla de metal tiene una temperatura inicial de 81.0 ° C. ¿Cuál es la temperatura final (en oC) del agua y la varilla de metal? La capacidad calorífica específica del agua es 4.184 J / K / g

 A solution has a volume of 2500 mL. How many liters is this?

2. A student carried out a reaction between iron and hydrochloric acid to make some iron (II) chloride crystals. She started with 5.6g of iron and used an excess of hydrochloric acid.

a. Write a balanced chemical equation for the reaction!    [3]

b. How many moles of iron did he start off with?    [2]

c. What mass of iron (II) chloride should he have expected from this reaction?    [2]

d. He actually obtained 9.17g of the iron (II) chloride. What was his percentage yield? [2]

When sodium chloride reacts with concentrated sulfuric acid, hydrogen chloride gas (HCl) is one of the products. 

H2SO4 (l) + NaCl (s) → NaHSO4 (s) + HCl (g)

If hydrogen chloride gas is dissolved in water, a solution of hydrochloric acid is formed. How If we react 9,8gram H2SO4 with 73gram NaCl. Determine:

a. Limiting reactant                   [4]

b. How many grams remaining agent is it?                  [3]

c. How many grams NaHSO4 will be produced?                [3]

d. How many liters HCl will be produced if we measure in STP condition?      [3]

Logam bismuth dapat dibuat dari reaksi bismuth (III) oksida dengan karbon sesuai reaksi:

Bi2O3 (s) + C (s) → Bi (s) +CO (g) (belum setara)

Bila direaksikan 50gram Bi2O3 dan 100gram karbon, tentukan:

a. Persamaan reaksi setara                   [2]

b. Pereaksi pembatasnya            [4]

c. Massa logam Bi yang dihasilkan (Ar Bi=208; O=16; dan C=12)          [6]

Kristal garam natrium karbonat (Na2CO3.nH2O) massanya 9.8gram direaksikan dengan asam klorida sampai habis dengan reaksi: 

Na2CO3 (s) + HCl (aq)→NaCl (aq) + H2O (l) +CO2 (g)

Ternyata dihasilkan gas CO2 sebanyak 1,12 L pada keadaan standar. Jika diketahui Ar Na= 23; C=12; O=16; dan H=1 Tentukan jumlah air kristal pada garam natrium karbonat tersebut!

the total pressure of gas collected over 785.0 mmhg and the temperature is 18.0 c. What is the pressure of hydrogen gas formed in mmHg

What happens when 1-methylcyclohexanol reacts with HBr reagent?

HA is a weak acid. Which equilibrium corresponds to the equilibrium constant K_b for A^-?

1. HA (aq) + H₂O (l) ↔ H₂A⁺ (aq) + OH^- (aq)
2. A^- (aq) + H₃O⁺ (aq) ↔ HA (aq) + H₂O (l)
3. HA (aq) + OH^- (aq) ↔ H₂O (l) + H⁺ (aq)
4. A^- (aq) + H₂O (l) ↔ HA (aq) + OH^- (aq)
5. A^- (aq) + OH^- (aq) ↔ HOA^2- (aq)