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Galina-37 [17]
3 years ago
12

a small cube of aluminum measures15.6mm on a side and weights 10.25g. What is the density of aluminum in g/cm3

Chemistry
1 answer:
astraxan [27]3 years ago
7 0
M - mass: 10,25g
V - volume: 1,56³[cm] = 3,796 cm³
d - density: ??
--------
d = m/v
d = 10,25/3,796
d = 2,7 g/cm³

:)
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An atom with the same number of protons and electrons has charge of
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Answer:

Explanation:

0

All the charges of the protons are cancelled out by all the charges on the electrons.

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open the phase diagram for co2 given in the introduction again. use the phase diagram for co2 in the interactive activity and de
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Due to the fact that ice is less thick than liquid water, the phase diagram of water has an odd melting point that drops with pressure. Carbon dioxide cannot exist as a liquid at atmospheric pressure, according to the phase diagram of the gas. Thus, gaseous carbon dioxide directly sublimes from solid carbon dioxide.

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The combustion of palmitic acid is represented by the chemical equation: C16H32O2(s) + 23O2(g) → 16 CO2(g) + 16 H2O(l) The magni
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The correct option is C

Explanation:

From the question we are told that

The reaction is

C_{16}H_{32}O_2(g) + 23O_2(g) \to 16 CO_2(g) + 16 H_2O(l)

Generally \Delta  H  =  \Delta  U + \Delta N*  RT

Here \Delta  H is the change in enthalpy

\Delta  U is the change in the internal energy

              \Delta N  is the difference between that number of moles of product and the number of moles of reactant

Looking at the reaction we can discover that the elements that was consumed and the element that was formed is O_2 and  CO_2 and this are both gases so the change would occur in the number of moles

So  

\Delta  H  =  \Delta  U + [16 -23]*  RT

\Delta  H  =  \Delta  U -7RT

The  negative sign in the equation tell us that the enthalpy\Delta_r H would be less than the Internal energy \Delta_r U

4 0
3 years ago
How many moles of KBr are present in 500 ml of a 0.8 M KBr solution?
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Step 1: Given data

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Step 2: Convert "V" to L

We will use the conversion factor 1 L = 1000 mL.

500 mL × 1 L/1000 mL = 0.500 L

Step 3: Calculate the moles of KBr (solute)

The molarity is the quotient between the moles of solute (n) and the liters of solution.

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Answer:

The answers are...

Explanation:

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