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S_A_V [24]
2 years ago
7

A hypothetical element, E, has two stable isotopes. One isotope has a natural abundance of 68.037% and has an atomic mass of 46.

449 u. If the atomic weight of E is 47.574 u, what is atomic mass (in units of u) of the second isotope.
Chemistry
1 answer:
I am Lyosha [343]2 years ago
6 0
  • If the abundance of the first isotope is 68.037%, then the abundance of the second isotope is 100%-68.037%.

Substituting into the atomic mass formula,

47.574=(46.449)(0.68037)+x(1-0.68037)\\\\ 47.574=31.60250613+0.31963x\\\\15.97149387=0.31963x\\\\x \approx \boxed{49.969 \text{ u}}

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If you start with 6 mol of nitrogen gas (N2+) what mass (g) of ammonia (NH4) will be produced?
Yanka [14]

Answer:

204g of NH3

Explanation:

The balanced equation for the reaction is given below:

N2 + 3H2 —> 2NH3

Next, we shall determine the number of mole NH3 produced by reacting 6moles of N2. This is illustrated below:

From the balanced equation above,

1 mole of N2 reacted to produce 2 moles of NH3.

Therefore, 6 moles of N2 will react to produce = 6 x 2 = 12 moles of NH3.

Finally, we shall convert 12 moles of NH3 to grams. This is illustrated below:

Number of mole of NH3 = 12 moles.

Molar mass of NH3 = 14 + (3x1) = 17g/mol

Mass of NH3 =..?

Mass = mole x molar mass

Mass of NH3 = 12 x 17

Mass of NH3 = 204g.

Therefore, 204g of NH3 will be produced from the reaction.

3 0
2 years ago
An igneous rock has a coarse texture and is dark in color. How else can this rock be accurately described?
Katen [24]

Answer:

produced from magma

Explanation:

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5 0
2 years ago
Assume that coal can be represented by the chemical formula C135H96O9NS. If 4.0 tons of coal is burned, what mass of nitrogen is
Schach [20]

Answer:

0.02 tons of NO produced when 4 tons of coal is burned

Explanation:

From the given,

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Let’s calculate the mass of nitrogen in coal

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Amount of NO produced by burning 4tons = 4\,tons\,of\,coal\times \frac{0.73tons}{100\,tons\,of\,coal}=0.0292\,tons

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8 0
3 years ago
Read 2 more answers
Which ion is the only negative ion produced by an Arrhenius base in water?
Snowcat [4.5K]
According to Arrhenius Theory of acids and bases, an Arrhenius base, when dissolving in water, produces the only negative ion: OH-. 

Therefore, (3) OH- is the correct answer.

Hope this is helpful~
6 0
2 years ago
Which grouping shows a decrease in Intermolecular
Anna11 [10]

Answer:

C) solid, liquid, gas

Explanation:

Which grouping shows a decrease in Intermolecular

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7 0
2 years ago
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