Inorganic Chemistry Answers

How many metric tons (t) of oxygen are in a sample of pitchblende that contains 2.3 t of uranium?

(Hint: Sample of 84.2 g pitchblende contains 71.4 g of uranium and oxygen is the only other element present

[B2(OH)4(O2)2]2-. Sodium perborate has the empirical formula NaBO3.4H2O,

Dissolve 4.77 g of sodium tetraborate decahydrate (borax) and 1.0 g of NaOH in 30 ml distilled water. Cool the solution in ice and slowly add 5.6 g of 30 % H2O2 solution. Sodium perborate will slowly begin to crystallise. Suction filter the cold solution rapidly through a filter pater. Retain the filtrate to see if further crystallisation occurs. Repeat filtration if further crystallization occurs, and combine the solids. Wash the product with cold distilled water and then with ethanol and finally with a small quantity of diethyl ether. Allow to air dry on a filter paper and determine the yield.

Post lab questions

• Write a balanced reaction equation for the preparation of the product. Na2B4O7.10H2O + ___H2O2 + __NaOH + ____H2O products

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• Starting with 4.77 g of borax, determine the theoretical yield. From your experimental yield, calculate the percentage yield. Actual yield is 5.4809g

Write down the electronic configuration of Ca20 and Sr 38 and their ground state spectral terms.

Cr2O7-2+Cl^- ->Cr⁺³+Cl

 0.3749 g soda ash sample is analyzed by titrating sodium carbonate with the standard 0.2388M HCl solution, requiring 49.38ml. The reaction is:

          CO₃^2-  + 2H⁺     →   H₂O +CO₂

Calculate the percent sodium carbonate in the sample

A 0.3749 g soda ash sample is analyzed by titrating sodium carbonate with the standard 0.2388M HCl solution, requiring 49.38ml. The reaction is:

          CO₃^2-  + 2H⁺     →   H₂O +CO₂

Calculate the percent sodium carbonate in the sample

Determine the concentration of a solution that contains 0.818 grams of Na3PO4 dissolved in 428.0 mL of water in molarity, molality, mole fraction.

Ammonia NH3 gas and oxygen O2 gas react to form nitrogen N2 gas and water H2O vapor. Suppose you have 7.0 mol of NH3 and 9.0 mol of O2 in a reactor. Calculate the largest amount of N2 that could be produced. Round your answer to the nearest 0.1 mol.

A certain strain of bacteria triples every 30

minutes. If a culture dish starts with 20

bacteria cells, how many will there be after

6 hours?

y = ab^x

The quantity 45.20 g of sucrose is dissolved in 316.0 g of water. Calculate (a) boiling point and(b) freezing point of the solution