Define what is the final temperature in a squeezed cold pack

Assignment Help Chemistry

Reference no: EM13260318

Instant cold packs used to treat athletic injuries contain solid NH4NO3 and a pouch of water. When the pack is squeezed, the pouch breaks and the solid dissolves, lowering the temperature because of the following endothermic reaction.

NH4NO3(s) + H2O(l) NH4NO3(aq) ?H = +25.7 kJ

What is the final temperature in a squeezed cold pack that contains 40.0 g of NH4NO3 dissolved in 135 mL of water? Assume a specific heat of 4.18 J/(g·°C) for the solution, an initial temperature of 25.0°C, and no heat transfer between the cold pack and the environment. To find the mass of water use the density of water = 1.0 g/mL. Hint: The process takes place at constant pressure. ____ Deg Celicus

Reference no: EM13260318

Questions Cloud

Converged to produce the printing press : What were the historical factors that converged to produce the printing press? And how did the printing press affect social relationships, religious institutions, economic transactions, and education?

Attract and retain members : If unions are to survive, what must they do to attract and retain members? Statement discussing what union workers believe they gain from unionization and what they stand to lose.

Where an externality exists in a current market : Explain what negative externalities are, and why there may be a case for government intervention to address them. Describe some of the ways to correct the negative externalities and the pros and cons of each method. Provide real life examples.

What is the peak magnitude of the electric field : If the magnetic field in a traveling EM wave has a peak magnitude of 13.3nT, what is the peak magnitude of the electric field

Define what is the final temperature in a squeezed cold pack : What is the final temperature in a squeezed cold pack that contains 40.0 g of NH4NO3 dissolved in 135 mL of water? Assume a specific heat of 4.18 J/(g·°C) for the solution, an initial temperature of 25.0°C

Branding activities organizations execute : Many stakeholders are impacted by the branding activities organizations execute. Who are the various internal and external stakeholders normally affected by branding activities and how do their motivations differ?

What would be your estimate of equity beta for frim a : If you find that equity beta is different between Frim A and its comparable firm in (a), how would you explain the difference? If you expect no difference explain why they are not different.

Mineralization-symbiotic relationship-enzymes used in food : A symbiotic relationship is when: All enzymes used in the food industry are: Mineralization. Detecting genetically engineered microorganisms in the environment is difficult because:

How to compute the mass of ice : Consider a glass of 167 mL of water at 29°C. Calculate the mass of ice at -15°C that must be added to cool the water to 10°C after thermal equilibrium is achieved. To find the mass of water use the density of water = 1.0.

User Account

All Pages