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3 years ago

Can someone help me please I would really appreciated

Chemistry

1 answer:

harina [27]3 years ago

3 0

Explanation:

whats the question. cause I didn't see it

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If there are 0.064g of theobromine in a 43g chocolate bar, how many moles of theobromine are there?

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Answer: $3.5\times 10^{-4}$

Explanation:

To calculate the moles, we use the equation:

$\text{Number of moles}=\frac{\text{Given mass}}{\text {Molar mass}}$

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Which of these statement describe a chemical property

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3 years ago

Please help on this one?

Bezzdna [24]

Answer:

$\text{C. } _{36}^{85}\text{Kr}$

Explanation:

Your nuclear equation is

$_{35}^{85}\text{Br} \longrightarrow \, _{-1}^{0}\text{e} +\, _{x}^{y}\text{X}$

The main point to remember in balancing nuclear equations is that

the sum of the superscripts and must be the same on each side of the equation.
the sum of the subscripts must be the same on each side of the equation.

Then

85 = 0 + y, so y = 85 - 0 = 0

35 = -1 + x, so x = 35 + 1 = 36

The nucleus with atomic number 36 and atomic mass 85 is krypton-85.

The nuclear equation becomes

$_{35}^{85}\text{Br} \longrightarrow \, _{-1}^{0}\text{e} + \, _{36}^{85}\text{Kr}$

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