Physical Chemistry Answers

What was the initial temperature when a 61 gram water system has been raised to 43 degrees Celsius with the addition of 1.05 kJ of energy?

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An unknown metal with a amass of 45 grams is heated to 96 degrees Celsius and dropped into 100 grams of water 18 degrees Celsius. If the final temperature of the mixture is 21.5 degrees Celsius, what is the specific heat capacity of the metal?

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What is the molarity of a solution obtained by diluting .125 mL of 6.00?M HCl to 500. mL

A solution is composed of one mole of non-volatile solute and four moles of volatile solvent. If the vapor pressure of the pure solvent is 20 torr, what is the vapor pressure of the solution?

A compound is formed when 6g of element A (with an AW of 24 g/mol) reacts with 15g of element B (with an AW of 20 g/mol). What is the empirical formula for the resulting compound?

can u please tell me how can i know that berlium for hexagonal close packing or calcium forms face centerd?

Consider the following reactions at 300 K.
A → B (uncatalysed reaction)
A →B (catalyst reaction)
The activation energy is lowered by 8.314 KJ mol–1 for the catalysed reaction. How many times the rate of this catalysed reaction greater than that of uncatalysed reaction ?
(1) 15 times
(2) 18 times
(3) 22 times
(4) 28 times

List 4 substances that would turn litmus paper red.

calculate the mass of nitric acid needed to make 400 tonnes of NH3