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yawa3891 [41]
3 years ago
11

Scientists discover two new elements, element A and element X, and are able to determine their atomic mass. Element A has an ato

mic mass of 17 amu. Element X has an atomic mass of 76 amu. These elements combine to form a compound with the following formula: A2X3. Determine the molar mass of this compound.
a.93 g/mol
b.98 g/mol
c.110 g/mol
d.245 g/mol
e.262 g/mol
Chemistry
1 answer:
Tresset [83]3 years ago
5 0
I think the answer is c 
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An atom has 81 electrons, 84 neutrons, and 82 protons. What element is this atom?
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Answer:

Lead

Explanation:

The subatomic particles within an atom can be used to know the atom or element given.

Of particular interest is the number of protons within the atom.

The periodic table is based on the atomic number of atoms. This atomic number is the number of protons within an atomic space.

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The number of protons given is 82, the element is  therefore lead.

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What is the mass of 4.5 x 10^22 molecules of hydrogen peroxide (H2O2)? Show your work in the space below.
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Given :

Number of molecules of hydrogen peroxide, N = 4.5 × 10²².

To Find :

The mass of given molecules of hydrogen peroxide.

Solution :

We know, 1 mole of every compound contains Nₐ = 6.022 × 10²³ molecules.

So, number of moles of hydrogen peroxide is :

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A student is determining the density of an unknown metal with a mass of 32.56 g. The student partially fills a graduated cylinde
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Density =.?

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