Calculating the amount of material reduced through electrolysis
Calculate the amount of gold deposited (in grams) from a solution of Au3+ if the electrolysis lasted 30 minutes at a current of 5.00A.
Stoichiometry
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Products of Radioactive Decays
What are the products of the following radioactive decays? A. Alpha emission by: 162 Re 75 B. Beta emission by: 188 W 74 C. Positron emission by: 165 Ta 73
The Production of Oxygen in Laboratories
The following reaction is used in laboratories to produce oxygen: 2KclO3 (s) ----> 2KCl (s) + 3O2 (g) At 25 degrees Celsius and one atmosphere pressure, how many liters of O2 gas will be produced from the reaction of 165g of KClO3? See attachment for better equation.
Calculating Whether the Amount of Lead in Water Meets Safety Regulations
The National Drinking Water standard for lead is no more than 0.015ppm. If a particular water supply sample has 2.5x10-7 moles of Pb per 5.0 liters, is it suitable for drinking?
Uses of mercury
1. Find out 2 or 3 uses for mercury. 2. For each use find out why mercury was chosen for the job 3. What are the dangers from using mercury.
How many moles of oxygen gas will react with 6.2 mol Al in the following reaction?
How many moles of oxygen gas will react with 6.2 mol Al in the following reaction? 4Al + 3O2 -> 2Al2O3.
Which chemical compound has the greatest mass of bromine?
Which substance contains the greatest mass of bromine? a) 60.0g NaBrO3 b) 30.0g MgBr2 c) 5.0g HBrO4 d) 0.10 mol KBr e) 0.10 mol HBr
Determining Number of Moles of Oxygen Atoms
How many moles of oxygen atoms are there in 3.00g of sodium dichromate, Na2CrO7?
Converting grams to kilojoules.
Burning 2.00g of propane, C3H8, produces 99.78 kJ of energy. How much energy is produced when one mole of the propane burns?
Determining the number of grams required by a reactant to produce a set number of grams of the product.
Oxygen gas can be prepared in a Laboratory by the reaction: 2KClO3(s) => 2KCl(s) + 3O2(g) How many grams of KClO3 must be reacted to produce100g of O2?
Unit Conversions And Solution Molarity Calculations
Convert 1) 75 mg/dL to mg/L 2) 592 uL to mL 3) What is the molarity of 45.0 g of NaCl dissolved in 1 L of water?