General Chemistry Answers

how many grams of silver iodide, AgI, are produced from 55.3

55.3 g of calcium iodide, CaI₂?

An unknown element (Y) is a nonmetal and has a valence electron configuration of ns²np4. (i) How many valence electrons does this element have? (ii) What is the formula of the compound this element would form with potassium? (iii) Would this element have a larger or smaller radius than barium? (iv) Would this element have a greater or smaller ionization energy than fluorine?

At what temperature will 4.15g of CO2 exert a pressure of 855 mmHg at a volume of 650 ml? (make sure to turn grams into moles)

Enter the electron configuration for Ne

Calculate the volume of 2.30 moles of gas exerting a pressure of 2.80 atm at 155°C.

A. Calculate the pH of a buffer made from 0.28 M HNO2 and 0.23

M NO2-. The ka for HNO2 is 4.6 x 10-4.

B. What is the pH of the solution containing 0.20 M NH3 and 0.15

M NHACI?

A. Calculate the pH of a buffer made from 0.28 M HNO2 and 0.23

M NO2-. The ka for HNO2 is 4.6 x 10-4.

The concentration of ethanoic acid in vinegar was measured as follows: A 50 cm3 sample of vinegar was diluted to 500 cm3 using deionised water. The diluted solution was titrated against 25 cm3 portions of a standard 0.12 M sodium hydroxide solution, using a suitable indicator. Titration reaction: CH3COOH(aq) + NaOH(aq) → CH3COONa(aq) + H2O(aq) After carrying out a number of accurate titrations of the diluted solution of ethanoic acid, the mean titration figure was found to be 20.5 cm3 . a) Calculate the concentration of ethanoic acid in the diluted vinegar solution in moles per liter. 

If I have an unknown quantity of gas at a pressure of 1.8 atm, a volume of 110 liters, and a temperature of 87 C, how many moles of gas do I have?

 1.   How many formula units of sodium nitrate will react with 20.0 g of calcium carbonate to product sodium carbonate and calcium nitrate according to the following reaction?    

2 Na(NO₃) + Ca(CO₃) à Na₂(CO₃) + Ca(NO₃)₂