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4 years ago

7

If an atom has 34 electrons, 46 neutrons, and 34 protons, what is its mass number? what is the name of the element?

1 answer:

OleMash [197]4 years ago

7 0

Mass number = protons + neutrons = 34+46 =80

the element with an atomic number of 34 and mass number of 80 is selenium

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Consider the equation for the formation of water. 2h2 o2 right arrow. 2h2o what is the theoretical yield of h2o if 130 g of h2o

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<h3>What is mass?</h3>

Mass or the theoretical yield is the result of the multiplication of mole and the molar mass of the compound.

The reaction between hydrogen and oxygen is shown as,

$\rm 2H_{2} + O_{2} \rightarrow 2H_{2}O$

Moles of water is calculated as:

$\begin{aligned}\rm moles &= \rm \dfrac{mass}{molar\; mass}\\\\&= \dfrac{18}{2}\\\\&= 9\;\rm moles\end{aligned}$

The theoretical yield of water is calculated as:

$\begin{aligned}\rm \text{weight of water} &= \rm moles \times molar \; mass\\\\&= 9 \times 18\\\\&= 162 \;\rm gm\end{aligned}$

Therefore, option D. 160 gm is the theoretical yield of water.

Learn more about theoretical yield here:

brainly.com/question/918691

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