Which unit is not a measurement of volume? cm L ml Cm^3

Please Help! How many molecules are in a 4.1 mole sample of CO?

SashulF [63]

Answer:

16.34884*10^-23 g/ molecule.

Explanation:

6 0

2 years ago

How much heat energy, in kilojoules, is required to convert 53.0 g of ice at −18.0 ∘C to water at 25.0 ∘C ? Express your answer

ANTONII [103]

Answer:

25.2 kJ of heat energy is required to convert 53.0 g of ice at −18.0 ∘C to water at 25.0 ∘C

Explanation:

Data: mass of ice = m = 53.0 g

Temperature of ice = T1 = -18.0 ∘C

Temperature of water = T2 = 25.0 ∘C

Change in Temperature = ΔT : T2-T1

Specific heat of ice = c(i) = 2.09 J/g . ∘C

Specific heat of water = c(w) = 4.18 J/g . ∘C

Enthalpy of fusion of water (when convert from ice to water) = ΔH(f) : 334 J/g

Enthalpy of vapourization of water (when convert from water to gas) = ΔH(v) :2250 J/g

Total heat required = q = ?

Solution: Heat required to melt the ice

T1 = -18 ∘C

T2 = 0 ∘C

Q1 = m x c(i) x ΔT

Q1 = 53.0 x 2.09 x (0-(-18))

Q1 = 53.0 x 2.09 x 18

Q1 = 1993.86 J is required by ice to reach to its

melting point.

Heat required to convert the ice into water

Q2 = ΔH(f) x m

Q2 = 334 x 53.0 = 17702 J is required by ice to

convert into water.

Heat required by water to reach at 25 ∘C

T1 = 0 ∘C

T2 = 25 ∘C

Q3 = m x c(w) x ΔT

Q3 = 53.0 x 4.18 x (25-0)

Q3 = 5538.5 J is required by water to reach at

25∘C .

Total heat required by 53.0 g of ice at −18.0 ∘C

to water at

25.0 ∘C

q = Q1 + Q2 + Q3

q = 1993.86 J + 17702 J + 5538.5 J

q = 25234.36 J is the total heat required 53.0 g

of ice at −18.0 ∘C to water at 25.0 ∘C.

Conversion from Joule (J) to Kilojoule (kJ)

1000 J = 1 kJ

q = 25234.36 J/1000

q = 25.23436 kJ

Conversion of heat in kJ to three significant

figures

q = 25.2 kJ

8 0

3 years ago

What products are formed when a hydrocarbon combusts?

Svetradugi [14.3K]

Answer:(a) hydrogen and oxygen

3 0

3 years ago

The ___ fluid compartment consists of fluid contained within all cells in the body and contains 2/3 of the body water in healthy

photoshop1234 [79]

Answer:

intracellular; extracellular

Explanation:

Intracellular fluid compartment is system which includes all the fluid which is enclosed in the cells by the plasma membranes of these cells. It lies in the cells and acts as the principal component of cytoplasm. ICF makes up about 2/3 of total water in human body.

Extracellular fluid is system which surrounds all the cells in body. The fluid has two primary constituents which are - fluid component of blood (known as plasma) and interstitial fluid (IF) which surrounds all the cells except blood. It accounts for other 1/3 of water content of the body.

6 0

3 years ago

A 1.000 g sample of nitrogen combined with a 0.0720 g sample of hydrogen to form N2H2. What compound is formed if 1.000 g of nit

bazaltina [42]

Answer:

N₂H₆

Explanation:

A 1.000 g sample of nitrogen combined with a 0.0720 g sample of hydrogen to form N₂H₂ .

1.000 g of nitrogen combines with 0.2160 g of hydrogen in the next compound .

In this compound the component of nitrogen remains the same but the component of hydrogen becomes .2160 / .0720 = 3 times .

Hence component of hydrogen in the new compound will change from

H2 to H6 .

Hence the chemical formula of new compound will be

N₂H₆ .

4 0

3 years ago