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3 years ago

I will do anything if someone answers this like pleaseeee ...?

Chemistry

1 answer:

Musya8 [376]3 years ago

7 0

I’d say C. It more inconsistent than D.
D & C are quite close.

Answer: C

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A quantity of 1.922 g of methanol (CH3OH) was burned in a constant-volume bomb calorimeter. Consequently, the temperature rose b

dezoksy [38]

Answer:

872.28 kJ/mol

Explanation:

The heat released is:

ΔH = C*ΔT

where ΔH is the heat of combustion, C is the heat capacity of the bomb plus water, and ΔT is the rise of temperature. Replacing with data:

ΔH = 9.47*5.72 = 54.1684kJ

A quantity of 1.922 g of methanol in moles are:

moles = mass / molar mass

moles = 1.992/32.04 = 0.0621 mol

Then the molar heat of combustion of methanol is:

ΔH/moles = 54.1684/0.0621 = 872.28 kJ/mol

5 0

3 years ago

Write ionic formulas for the following compounds:

lakkis [162]

You may find the chemical formulas for the ionic compounds below.

Explanation:

a. Calcium Bromide - CaBr₂

b. Potassium Phosphide - K₃P

c. Iron (III) Oxide - Fe₂O₃

d. Iron (II) Oxide - FeO

e. Magnesium Hydroxide - Mg(OH)₂

f. Nickel (III) Sulfate - Ni₂(SO₄)₃

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chemical formulas of ionic compounds

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6 0

3 years ago

A magnesium (Mg) atom gives one electron to two atoms of another element, then it takes on a 2+ charge. The two atoms of the oth

Setler [38]

Answer:

See below

Explanation:

You missed the following elements, but any element with 7 valence electrons could behave like that: Cl, Br, I, F, etc

3 0

3 years ago

Read 2 more answers

Hot air at 80°C is blown over a 2-m by> on0 4-m flat surface at 30°C. If the average? convection heat transfer coefficient va

mars1129 [50]

Explanation:

The given data is as follows.

$T_{air} = 80 ^{o}C$ , $T_{surface} = 30 ^{o}C$

Area of the flat plate is 2 × 4 = 8 $m^{2}$ .

Average convection heat transfer coefficient $(h_(avg))$ = $\frac{(20 + 100) W/m^{2} ^{o}C}{2}$ = $60 W/m^{2} ^{o}C}$ .

Hence, formula to calculate heat transfer through convection from air to the water is given as follows.

q = $h_{avg} \times A_{surface} \times (T_{air} - T_{surface})$

= $60 W/m^{2} ^{o}C} \times 8 m^{2} \times [(80 - 30)]^{o}C$

= 24000 W

or, = 24 kW

Hence, the direction of heat flow is from air to the surface.

Thus, we can conclude that transfer of heat is 24 kW.

7 0

2 years ago

The physical properties of a substance containing the bonded atoms y and z ?

pav-90 [236]

I think the answer is hmmm I think

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2 years ago