Chemistry Answers

A PURE SAMPLE OF SODIOUM FLORIDE CONTAINS 35g of sodium. how many grams of fluorine are present in this sample.

For the reaction: C(s) + H2O(g) ֖CO(g) + H2(g), what would be the effect on the

equilibrium system if H2O increases

If Kp>1 for a reaction, comment on the sign of standard free energy change of the reaction.

One of the main reactions involved in the production of iron from iron(III) oxide as found in iron ore, proceeds according to the following balanced chemical equation:Fe₂O₃ (s) + 3 C(s)  →  2 Fe(s) + 3 CO(g)

We will consider the reaction of iron(III) oxide and carbon on a gram scale, although the same stoichiometry applies on the tonne scale.

If 22.7 g of carbon is available, what is the maximum mass of iron which can be produced when the iron(III) oxide is present in excess?

Enter your answer to three significant figures. Do not include units.

Assume that mitochondria contain 0.47 Molar KCL and 0.015 Molar NaCl. Calculate the grams per liter, of a carbohydrate similar to glucose with a molecular weight 280 amu, that will have the same osmolarity as the mitochondria..

Suppose you mixed 1.65 grams of calcium chloride and 2.05 grams of sodium carbonate. What's the theoretical yield of the solid product?

Suppose you decompose 0.250 mole of Ag2S into its element. How many moles of silver would you have? How many moles of sulfur would you have?

Since iron is more reactive than copper, it displaces the copper ions from the aqueous solution of copper sulphate. This is called a single displacement reaction of one metal by another metal. To experimentally test this, Joel reacted 0.9845 g of iron fillings with an excess of copper sulphate solution. When the reaction was complete the solution had changed from blue to green and a copper deposit weighing 1.024 g had formed in the solution. In this reaction, metallic iron is converted into ferrous ion (Fe2+) and cupric ion (Cu2+) is converted into metallic copper.

a) Calculate the number of moles of iron used and the number of moles of copper formed.

b) Calculate the theoretical mass of copper that was expected to be produced and hence determine the percentage yield of Joel’s experiment.

How many molecules of iron are present in 0.9845 g of iron fillings?

Question:

The organic compound below is abbreviated Tris and is basic. The conjugate acid (TrisITT has a pKa of 8.10.

TrisH+ + H20 = Tris + H30 +

Tris is commonly used as a component in buffer solutions to study biochemical reactions.

a) A buffer solution is prepared by mixing 12.5 mL of 0.100 mol L- 1 HCl with 25.0 mL of0.100 mol L- 1 Tris. What is the pH of this buffer? Write all the equations used and explain your steps.

b) The buffer was used to study an enzyme-catalyzed reaction in which 0.00020 mol of H30+ was produced. What is the pH of the solution after the acid reacted with the buffer? Write all the equations used and explain your steps.

Write the balanced NET IONIC equation for the reaction that occurs when hydrochloric acid and potassium hypochlorite are combined.

Use H₃O⁺ instead of H⁺.

This reaction is classified as:

A. Strong Acid + Strong Base

B. Weak Acid + Strong Base

C. Strong Acid + Weak Base

D. Weak Acid + Weak Base

The extent of this reaction is:

.

A. ... Below 50%

B. ... 50%

C. ... Above 50%

D. ... 100%