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3 years ago

I need help in this can someone help

Chemistry

1 answer:

GalinKa [24]3 years ago

4 0

Answer:

the limiting reagent is butane

Explanation:

5C₄H₁₀ + 25O₂ → 20CO₂ + 5H₂0

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How much energy is released by the decay of 3 grams of 230Th in the following reaction 230 Th - 226Ra + "He (230 Th = 229.9837 g

Serhud [2]

Answer: The energy released for the decay of 3 grams of 230-Thorium is $2.728\times 10^{-15}J$

Explanation:

First we have to calculate the mass defect $(\Delta m)$ .

The equation for the alpha decay of thorium nucleus follows:

$_{90}^{230}\textrm{Th}\rightarrow _{88}^{226}\textrm{Ra}+_2^{4}\textrm{He}$

To calculate the mass defect, we use the equation:

Mass defect = Sum of mass of product - Sum of mass of reactant

$\Delta m=(m_{Ra}+m_{He})-(m_{Th})$

$\Delta m=(225.9771+4.008)-(229.9837)=1.4\times 10^{-3}amu=2.324\times 10^{-30}kg$

(Conversion factor: $1amu=1.66\times 10^{-27}kg$ )

To calculate the energy released, we use Einstein equation, which is:

$E=\Delta mc^2$

$E=(2.324\times 10^{-30}kg)\times (3\times 10^8m/s)^2$

$E=2.0916\times 10^{-13}J$

The energy released for 230 grams of decay of thorium is $2.0916\times 10^{-13}J$

We need to calculate the energy released for the decay of 3 grams of thorium. By applying unitary method, we get:

As, 230 grams of Th release energy of = $2.0916\times 10^{-13}J$

Then, 3 grams of Th will release energy of = $\frac{2.0916\times 10^{-13}}{230}\times 3=2.728\times 10^{-15}J$

Hence, the energy released for the decay of 3 grams of 230-Thorium is $2.728\times 10^{-15}J$

5 0

3 years ago

How many atoms of carbon are in 6.00 g of carbon?

kramer

Answer:

12 atoms

C-12.thats all

5 0

3 years ago

How many orbitals are there in the n = 4 level of the h-atom?

Nikolay [14]

The H-atom has fourth energy level with n=4.

This energy level can have values of orbital angular momentum l = 0, 1, 2, 3

Now each l can also have magnetic momentum ml from – l to l.

Therefore,

l = 0

ml = 0

l = 1

ml = -1, 0, 1

l = 2

ml = -2, -1, 0, 1, 2

l = 3

ml = -3, -2, -1, 0, 1, 2, 3

Now adding up all the number of ml’s will give us the total number of orbitals:

orbitals = 1 + 3 + 5 + 7

orbitals = 16

Alternatively, we can simply use the formula:

orbitals = n^2 = 4^2 = 16

8 0

3 years ago

Which of the following statements about ions is NOT CORRECT?

madam [21]

Answer:

B. Anions are formed when an atom loses electrons.

7 0

3 years ago

A quantity of Lithium reacts with sulfuric acid (H2SO4) to produce .10 g of hydrogen. How many grams of lithium are required ?

Ilya [14]

Answer:

0.35 g Li

Explanation:

H2SO4 + 2Li -> Li2SO4 + H2

7 g Li -> 2 g H2

x -> 0.10 g H2

x= (0.10 g H2 * 7 g Li)/ 2 g H2 x= 0.35 g Li

3 0

3 years ago