You are conducting a calorimetry experiment using a calorimeter with 500 ml of water in its outer chamber to determine the enthalpy of reaction of a chemical reaction. The initial temperature of the water was 25 °C. After the reaction, the temperature of the water was 57.4 °C. Disregarding any heat loss to the walls of the container, calculate the H1). (The
specific heat of the water is 4.18 J/(8.K).

A 16.2kj

B 2.09kj

C 0.14kj

D 67.7kj

E 135.4kj

Find the number of grams of hcl needed to react completely with .50 moles of magnesium.

The content of manganese (mn) in steel was determined spectrophotometrically and with the use of the standard addition method. an unknown sample of mn from a digested steel sample gave an absorbance of 0.185 when analyzed spectrophotometrically. when 5.00 ml of solution containing 95.5 ppm mn was added to 50.0 ml of the unknown steel solution (digested sample), the absorbance was 0.248. calculate the concentration, in parts-per-million (ppm), of mn in the digested steel sample solution.

Correct relationship between molecular formula and empirical formula