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3 years ago

Which of the following is a polyatomic ion? O A. HCI O B. Na O C. PO, O D. 52

Chemistry

2 answers:

timurjin [86]3 years ago

8 0

I'm not the best with science but I believe the answer is B. Na.

KengaRu [80]3 years ago

8 0

Answer is b .Nani think

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There are 0.55 moles of carbon dioxide gas in a 15.0 L container. This container is at a temperature of 300 K. What is the press

sertanlavr [38]

Answer:

$\large \boxed{\text{D.) 91 kPa}}$

Explanation:

We can use the Ideal Gas Law — pV = nRT

Data:

V = 15.0 L

n = 0.55 mol

T = 300 K

Calculation:

$\begin{array}{rcl}pV & =& nRT\\p \times \text{15.0 L} & = & \text{0.55 mol} \times \text{8.31 kPa$\cdot$ L$\cdot$K$^{-1}$mol$^{-1}\times$ 300 K}\\15.0p & = & \text{1370 kPa}\\p & = & \textbf{91 kPa}\end{array}\\\text{The pressure in the container is $\large \boxed{\textbf{91 kPa}}$}$

6 0

3 years ago

It takes 2,500,00 Liters of Helium to fill the Goodyear Blimp. How many moles is this?

Valentin [98]

Answer:

102.26 moles of helium were required to Fill the Goodyear Blimp

Explanation:

To solve this question we need to use combined gas law:

PV = nRT

<em>Where P is pressure, V is volume of gas (2500L), n are moles of gas (Our incognite), R is gas constant (0.082atmL/molK) and T is absolute temperature</em>

<em />

Assuming atmospheric condition we can write P = 1atm and T = 25°C = 298.15K

Replacing:

PV/RT = n

1atm*2500L / 0.082atmL/molK*298.15K = n

<h3>102.26 moles of helium were required to Fill the Goodyear Blimp</h3>

<em />

3 0

2 years ago

How are elements in each group the same?

Amanda [17]

Answer:

They share the same number of electrons in their valence subshells.

Explanation:

They have the same number of electrons on the outer shell.

6 0

3 years ago

You discover a new substance that mixes well with H2O initially, but eventually the particles sink to the bottom. What is the BE

AVprozaik [17]

I believe this would be colloid

7 0

3 years ago

Is there any easy tip to balance the eauation.

Viefleur [7K]

Answer:

Explanation:

You just have to see the REACTANTS and PRODUCTS and look how much molecules are there and accordingly put numbers.

Eg:4Fe+3O2--------->2Fe2O3

5 0

3 years ago