Try to answer all of the questions or just 1, 2, and 3 pleaseee I'm stupid

5x^2 + 3×^2-x+7x<br>Help plz

PSYCHO15rus [73]

Answer:

5x^2 + 3x^2 -x +7x

$5x^2+3x^2+6x = 8x^2+6x$

factorize it to get

2x(4x+3)

3 0

4 years ago

A. At STP, what is the volume of 708 mol of nitrogen gas? 708 mol = 708 mol X L B. A sample of hydrogen gas occupies 14.1 L at S

elena-14-01-66 [18.8K]

Answer:

A. 15859.2 L or 15900 L

B. 0.629 mol

Explanation:

At STP, one mole is equal to approximately 22.4 L

L or mL is volume, so you are attempting to solve for L or mL.

A.

708 mol x (22.4 L/1 mol) = 15859.2 L (w/ significant figures included - 15900 L)

B.

(14.1 L) x (1 mole/ 22.4 L) = 0.629 mol.

5 0

3 years ago

What will be the effect on the solubility of BaF2 if the following changes are made: increasing temperature; adding NaF; adding

borishaifa [10]

In BaF₂ the solubility will decreases on adding NaF

the solubility will increases on adding HCl

<h3>SOLUBILITY OF BARIUM FLUORIDE</h3>

Increase in temperature will increase the solubility of the solid.
By adding NaF - decrease the solubility of BaF₂
By adding HCl - increase the solubility of BaF₂

<h3>BARIUM FLUORIDE</h3>

It is colourless solid that occur as rare mineral
It is corroded by moisture
It is used in window of IR spectroscopy

Hence the barium fluoride the solubility decreases on adding NaF and increases on adding HCl.

Learn more about the solubility on

brainly.com/question/6841847

#SPJ4

3 0

2 years ago

To make use of an ionic hydrate for storing solar energy, you place 422.0 kg of sodium sulfate decahydrate on your house roof. A

Law Incorporation [45]

Complete Question

To make use of an ionic hydrate for storing solar energy, you place 422.0 kg of sodium sulfate decahydrate on your house roof. Assuming complete reaction and 100% efficiency of heat transfer, how much heat (in kJ) is released to your house at night? Note that sodium sulfate decahydrate will transfer 354 kJ/mol.

Answer:

The amount of energy released is $x = 4.63650 *10^5 KJ$

Explanation:

Number of moles is mathematically represented as

$n =\frac{mass}{Molar\ Mass}$

substituting $422.0kg = 422 *10^3g$ for mass of sodium sulfate decahydrate( $Na_2 SO_4 \cdot 10H_2 O$ ), $322.2g/mol$ (This value is a constant )for the molar mass of sodium sulfate decahydrate