Mathematics: Help please like desperately in need of help

Help please like desperately in need of help

noobgirlaskthequest

05.12.2021

8x^2+2x+3 where ^2 means the 2 is an exponent.

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EBeast9741

05.12.2021

-8x^2 -2x+13

Step-by-step explanation:

group liked terms

-6x^2-2x^2-2x+5+8

Add numbers 5+8=13

-6^2-2x^2-2x+13

add similiar elements -6x^2-2x^2=-8x^2

-8x^2 -2x+13

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Biank2286

12.06.2020

The volume of given amount O_2 at STP is 1.12 L

Explanation:

To calculate the number of moles, we use the equation:

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

Given mass of oxygen = 1.6 g

Molar mass of oxygen = 32 g/mol

Putting values in above equation, we get:

$\text{Moles of oxygen}=\frac{1.6g}{32g/mol}=0.05mol$

At STP:

1 mole of a gas occupies 22.4 liters of volume.

So, 0.05 moles of oxygen gas will occupy = $\frac{22.4L}{1mol}\times 0.05mol=1.12L$ of volume.

Thus, the volume of given amount O_2 at STP is 1.12 L

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