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3 years ago

According to the wave mechanical model, an orbital is defined as the

1 answer:

4 0

B. a circular path for electrons . because orbital is a mathematically described region around a nucleus in a atom or molecule that may contain zero , one , or two electrons. <span />

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From the unbalanced reaction: B2H6 + O2 ---> HBO2 + H2O

Drupady [299]

Answer: 125 g

Explanation:

To calculate the moles :

$\text{Moles of solute}=\frac{\text{given mass}}{\text{Molar Mass}}$

$\text{Moles of} B_2H_6=\frac{36.1g}{17}=1.30moles$

The balanced reaction is:

$B_2H_6+3O_2\rightarrow 2HBO_2+2H_2O$

According to stoichiometry :

1 mole of $B_2H_6$ require = 3 moles of $O_2$

Thus 1.30 moles of $B_2H_6$ will require= $\frac{3}{1}\times 1.30=3.90moles$ of $O_2$

Mass of $O_2=moles\times {\text {Molar mass}}=3.90moles\times 32g/mol=125g$

Thus 125 g of $O_2$ will be needed to burn 36.1 g of $B_2H_6$

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3 years ago

In an ionic compound, the charges of the _ and _ must balance to produce an electrically substance.

solong [7]

Answer:

positive(cations) and negative(anions)

Explanation:

5 0

3 years ago

A science teacher has a supply of 20% saline solution and a supply of 50% saline solution. How much of each solution should the

lilavasa [31]

Answer:

Explanation:

$\text{Let}\\\\x-\text{a volume of}\ 20\%\ \text{saline solution}\\\\y-\text{a volume of }\ 50\%\ \text{saline solution}\\\\p\%=\dfrac{p}{100}\\\\20\%=\dfrac{20}{100}=\dfrac{2}{10}=0.2\\\\50\%=\dfrac{50}{100}=\dfrac{5}{10}=0.5\\\\0.2x-\text{a volume of salt in }\ 20\%\ \text{saline solution}\\0.5y-\text{a volume of salt in }\ 50\%\ \text{saline solution}\\\\60mL-\text{a volume of}\ 28\%\ \text{saline solution}\\\\28\%=\dfrac{28}{100}=0.28$

$0.28\cdot60mL=16.8mL-\text{a volume of salt in }\ 28\%\ \text{saline solution}\\\\\text{Equations}\\\\(1)\qquad x+y=60\\(2)\qquad0.2x+0.5y=16.8$

$\left\{\begin{array}{ccc}x+y=60\\0.2x+0.5y=168&\text{multiply both sides by 10}\end{array}\right\\\left\{\begin{array}{ccc}x+y=60&\text{multiply both sides by (-2)}\\2x+5y=168}\end{array}\right\\\underline{+\left\{\begin{array}{ccc}-2x-2y=-120\\2x+5y=168}\end{array}\right}\qquad\text{add both sides of the equations}\\.\qquad3y=48\qquad\text{divide both sides by 3}\\.\qquad y=16$

$\text{Put the value of}\ y\ \text{to the first equation:}\\\\x+16=60\qquad\text{subtract 16 from both sides}\\x=44$

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4 years ago

I WILL MARK YOU BRAINLIST <br><br> what is the difference between an element and an isotope

Anika [276]

Answer:

An isotope is one of two or more forms of the same chemical element. Different isotopes of an element have the same number of protons in the nucleus, giving them the same atomic number, but a different number of neutrons giving each elemental isotope a different atomic weight.

Explanation:

I hope you have a nice day and please mark me(:

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3 years ago

Read 2 more answers

Complete as seguintes equações e indique os pares de ácido 1 base 1 e ácido 2 base 2 a) HNO2 + H2O b) H2PO-4 + H30- C) C6H5 – NH

gavmur [86]

Answer:

The answer is C.

Explanation:

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3 years ago