6. What is the atomic mass of Hafnium if out of every 200 atoms, 10 have mass 176.00 g/mol, 38 have mass

According to Table I, which salt releases energy as it dissolves?

CaHeK987 [17]

According to the table, I, LIBr releases energy as it dissolves.
<span>Lithium bromide is a synthesized compound of lithium and bromine. Its ultimate hygroscopic quality makes LiBr serviceable.</span>

3 0

3 years ago

Why must living things rely on thousands of catalysts for chemical reactions necessary for life?

just olya [345]

<span>It affects only one chemical reaction</span>

8 0

3 years ago

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Please Help Asap! :)

Assoli18 [71]

i think its the last one

4 0

3 years ago

Describe what happens to particles as they go through a phase change and energy is added

S_A_V [24]

Solid-When a solid is heated the particles gain energy and start to vibrate faster and faster. Initially the structure is gradually weakened which has the effect of expanding the solid. Further heating provides more energy until the particles start to break free of the structure. Although the particles are still loosely connected they are able to move around. At this point the solid is melting to form a liquid.

Liquid-As the liquid gets warmer more particles have sufficient energy to escape from the liquid. Eventually even particles in the middle of the liquid form bubbles of gas in the liquid. At this point the liquid is boiling and turning to gas. The particles in the gas are the same as they were in the liquid they just have more energy. At normal atmospheric pressure all materials have a specific temperature at which boiling occurs. This is called the "boiling point" or boiling temperature.

Description of Phase Change Term for Phase Change Heat Movement During Phase Change

Solid to liquid Melting Heat goes into the solid as it melts.

Liquid to solid Freezing Heat leaves the liquid as it freezes.

Liquid to gas Vaporization, which includes boiling and evaporation. Heat goes into the liquid as it vaporizes.

Gas to liquid Condensation Heat leaves the gas as it condenses.

Solid to gas Sublimation Heat goes into the solid as it sublimates.

3 0

4 years ago

23 grams of sodium reacts with 293 cm 3 of water that is initially at 298 K. It produces an enthalpy change of 197 kJ. What is t

muminat

Answer:

THE FINAL TEMPERATURE OF WATER IS 459.32 K

Explanation:

Mass of sodium = 23 g

Volume of water = 293 cm3

Initial temperature = 298 K

Specific heat capacity of water = 4.18 J/Kg

Enthalpy change = 197 kJ = 197, 000 J

Heat = mass * specific heat * change in temperature

From the statement it shows that the initial temperature is 298 K or 25 °C and at this temperature the density of water is 0.99707 g/mL

Hence we can calculate the mass of water by using this formula:

Mass = volume * density

Mass = 293 cm3 * 0.99707 g/mL

Mass = 292.14 g

The enthalpy change = mass * specific heat * change in temperature

197, 000 = 292.14 * 4.18 * change in temperature

Change in temperature = 197 000 / 292.14 * 4.18

Change in temperature = 197 000 / 1221.1452

Change in temperature = 161.32 K

Hence, the final temperature of the water is therefore the addition of initial temperature and the change in temperature

Final temperature = initial temp + change in temp

Final temp = 298 K + 161.32 K

Final temp = 459.32 K

In conclusion, the final temperature of water is 459.32 K

5 0

3 years ago

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