Oliver heated tungsten cylinder weighing 60 g in a hot water bath. While that was heating , he added 40.37 g of distilled water to a styrofoam cup calorimeter and measures its temperature at 21.3 C. Oliver then added the hat tungsten to the calorimeter and observed a final temperature of 24.9 C. What was the initial temperature, in C of tungsten cylinder. Specific heat of tungsten is 0.132 Specific hest of water is 4.184

21.12°C

Explanation:

Q = m×c×∆T

Where;

m= mass

c= specific heat capacity

∆T = change in temperature

Qwater = - (Qtungsten)

Note that; the initial temperature of tungsten = final temperature of water

For Water, m= 40.37g, initial temperature=21.3°C, c= 4.184J/g°C

For tungsten, m= 60g, final temperature=24.9°C, c= 0.132J/g°C

(m×c×∆T)water = - (m×c×∆T)tungsten

40.37 × 4.184 × (T-21.3) = - {60 × 0.132 × (24.9-T)}

168.91 (T-21.3) = - { 7.92 (24.9-T)}

168.91T - 3597.8 = - (197.21 - 7.92T)

168.91T - 3597.8 = - 197.21 + 7.92T

168.91T - 7.92T = - 197.21 + 3597.8

160.99T = 3400.59

T = 3400.59/160.99

T = 21.12°C

Therefore, the initial temperature, in °C of tungsten cylinder is 21.12°C

the leaf is an organ of a typical plant, and the main functions are to complete photosynthesis and allow the plant to exchange gas, just like how we have the respiratory system. leaves have the stomata, which collects maintains co2 and o2 levels. this is necessary for cell metabolism. the leaf also collects sunlight using chloroplasts. succinctly, leaves own a pivotal role in sustaining plant life.

the correct answer is b. a strong acid completely dissociates to its ions when dissolved in water. completely dissociates to and ions. a is incorrect because does not fully ionize to and ions and some remain as the compound . c and d are incorrect because, and do not fall into the category of bronsted lowry acids. a bronsted lowry acid is a proton donor and since both molecules do not have a proton to donate they are not bronsted lowry acids. likewise,   if we use the lewis acid definition, they cannot be acids. a lewis acid is an electron pair acceptor. both and have a complete octet so can not accept any electrons which disqualifies them as acids.