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2 years ago

12

Which statements accurately describe volume? Check all that apply.

2 answers:

allsm [11]2 years ago

7 0

Answer:

the answer is the number three

Nitella [24]2 years ago

3 0

Answer: the right answer is 1,4&5

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Hydrofluoric acid, hf(aq), cannot be stored in glass bottles because compounds called silicates in the glass are attacked by the

Trava [24]

1) Chemical equation

Na2 SiO3 (s) + 8 HF (aq) ---> H2 Si F6 (aq) + 2 Na F (aq) + 3H2O (l)

It is balanced

2) Molar ratios

1 mol Na2 SiO3 : 8 mol HF.

3) Proportion

0.340 mol Na2 SiO3 * 8 mol HF / 1mol Na2SiO3 = 2.72 mol HF.

Answer: 2.72 mol HF

5 0

3 years ago

Hydrological power harnesses energy through the movement of water in rivers. Which statement represents an added benefit to this

tekilochka [14]

D) releases greenhouse gasses

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3 years ago

Read 2 more answers

How do autotrophs (plants) recycle matter?

Sloan [31]

Through absorbing nutrients and matter and the releasing new matter, usually in the form of CO2<span />

4 0

3 years ago

Given the reaction: 2H₂ + O₂ → 2H₂O The total number of grams of O₂ needed to produce 54 grams of water is _________.

Vedmedyk [2.9K]

Answer : The mass of $O_2$ needed are, 48 grams.

Explanation :

First we have to calculate the moles of $H_2O$

$\text{Moles of }H_2O=\frac{\text{Given mass }H_2O}{\text{Molar mass }H_2O}=\frac{54g}{18g/mol}=3mol$

Now we have to calculate the moles of $O_2$

The given balanced chemical reaction is:

$2H_2+O_2\rightarrow 2H_2O$

From the reaction, we conclude that

As, 2 mole of $H_2O$ produces from 1 mole of $O_2$

So, 3 mole of $H_2O$ produces from $\frac{3}{2}=1.5$ mole of $O_2$

Now we have to calculate the mass of $O_2$

$\text{ Mass of }O_2=\text{ Moles of }O_2\times \text{ Molar mass of }O_2$

Molar mass of $O_2$ = 32 g/mole

$\text{ Mass of }O_2=(1.5moles)\times (32g/mole)=48g$

Therefore, the mass of $O_2$ needed are, 48 grams.

4 0

3 years ago

What is the molarity of a NaOH solution when 22.14 mL of 0.105 M oxalic acid is needed to

jeka57 [31]

The molarity of the NaOH solution required for the reaction is 0.186 M

We'll begin by writing the balanced equation for the reaction

H₂C₂O₄ +2NaOH —> Na₂C₂O₄ + 2H₂O

From the balanced equation above,

The mole ratio of the acid, H₂C₂O₄ (nA) = 1

The mole ratio of the base, NaOH (nB) = 2

From the question given above, the following data were obtained:

Volume of the acid, H₂C₂O₄ (Va) = 22.14 mL

Molarity of the acid, H₂C₂O₄ (Ma) = 0.105 M

Volume of the base, NaOH (Vb) = 25 mL

<h3>Molarity of the base, NaOH (Mb) =? </h3>

MaVa / MbVb = nA/nB

(0.105 × 22.14) / (Mb × 25) = 1/2

2.3247 / (Mb × 25) = 1/2

Cross multiply

Mb × 25 = 2.3247 × 2

Mb × 25 = 4.6494

Divide both side by 25

Mb = 4.6494 / 25

<h3>Mb = 0.186 M</h3>

Therefore, the molarity of the base, NaOH solution is 0.186 M

Learn more: brainly.com/question/25739717

4 0

2 years ago