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inessss [21]
3 years ago
9

5. How many elements do we have in Octane?

Chemistry
1 answer:
jekas [21]3 years ago
3 0

Answer:

2 elements

Explanation:

Octane is composed of carbon and hydrogen atoms.

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What is the mass of 8.12 × 10^23 molecules of CO2 gas? (Atomic mass of carbon = 12.011 u; oxygen = 15.999 u.)
amid [387]

Answer:

m=59.3gCO_2

Explanation:

Hello,

In this case, the first step is to compute the molar mass of carbon dioxide as shown below, considering it has one carbon atom and two oxygen atoms:

M=12.011g/mol+2*15.999g/mol\\\\M=44.009g/mol

It is important to notice it is the mass in one mole of such compound. Afterwards, we need to use the Avogadro's number to compute the how many moles are in the given molecules of carbon dioxide as shown below:

mol=8.12x10^{23}molec*\frac{1mol}{6.022x10^{23}molec} =1.35mol

Finally, the mass by using the molar mass:

m=1.35mol*\frac{44.009g}{1mol} \\\\m=59.3gCO_2

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2 years ago
A particular atom has 58 protons and 82 neutrons. What are the atomic number, mass number, and periodic table symbol of this iso
anygoal [31]
Atomic Numbers are the number of protons within the nucleus,
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Atomic Number=58
Mass Number is the sum of the protons and neutrons in the nucleus, 
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Mass Number=140
Periodic symbol of this isotope is entirely dependent on the number of protons, 58, which corresponds to the element Cerium, abbreviated as Ce in the periodic table. 
Periodic Symbol=Ce
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When Aluminum foil is added to a solution of Copper (II) chloride (blue color solution), the following reaction occurs.
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Kruka [31]

Answer:

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Explanation:

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The International Bottled Water Association (IBWA), Alexandria, Va., and Beverage Marketing Corporation (BMC), New York, recently released 2015 bottled water statistics showing that Americans' consumption of bottled water increased by 7.9 percent and bottled water sales were up 8.9 percent from the previous year.

Explanation:

7 0
2 years ago
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