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3 years ago

How many neutrons are in calcium nitride

Chemistry

1 answer:

xxTIMURxx [149]3 years ago

8 0

Answer:

Explanation:

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An ideal gas cannot exist outside of ideal gas conditions<br><br> true or false ?

zzz [600]

Answer:

Yes

Explanation:

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3 years ago

How many grams of KCl are needed to prepare 0.750 L of a 1.50 M solution in water?

dlinn [17]

Answer: Option A) 83.9g

Explanation:

KCl is the chemical formula of potassium chloride.

Given that,

Amount of moles of KCl (n) = ?

Volume of KCl solution (v) = 0.75L

Concentration of KCl solution (c) = 1.5M

Since concentration (c) is obtained by dividing the amount of solute dissolved by the volume of solvent, hence

c = n / v

make n the subject formula

n = c x v

n = 1.5M x 0.75L

n = 1.125 mole

Now given that,

Amount of moles of KCl (n) = 1.125

Mass of KCl in grams = ?

For molar mass of KCl, use the molar masses of:

Potassium, K = 39g;

Chlorine,Cl = 35.5g

KCl = (39g + 35.5g)

= 74.5g/mol

Since, amount of moles = mass in grams / molar mass

1.125 mole = m / 74.5g/mol

m = 1.125 mole x 74.5g/mol

m = 83.81g

Thus, 83.9 grams of KCl are needed to prepare 0.750 L of a 1.50 M solution in water

3 0

3 years ago

When the reaction A → B + C is studied, a plot 1/[A]t vs. time gives a straight line with a positive slope. What is the order of

zloy xaker [14]

Answer:

Second order

Explanation:

Given that:

When the reaction A → B + C is studied, a plot 1/[A]t vs. time gives a straight line with a positive slope.

From the integration method for the second order of reaction.

Suppose that:

rate = k₂[A]²

∴

$\dfrac{1}{A}=\dfrac{1}{A_0}+k_2t$

Therefore, a plot of the linear function $\dfrac{1}{A}$ versus t will be linear with a positive slope k₂ and the intercept on the concentration axis will be $\dfrac{1}{A_o}$

The linear plot for a second order reaction can be seen in theimage attached below.

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3 years ago

An apple has a mass of 297 grams. How many kilograms is this? (Note: You can use the information in the table below to make a co

yan [13]

.297 kilograms
297g x 1 kg/100 g = .297

4 0

3 years ago

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A gas has an initial volume of 455 mL at 105ºC and a final volume of 235 mL. What is its final temperature in Celsius degrees?

Oksana_A [137]

Hello!

To solve this problem we're going to use the Charles' Law. This Law describes the relationship between Volume and Temperature in an ideal gas. Applying this law we have the following equation:

$\frac{V1}{T1} = \frac{V2}{T2} \\ \\ T2= \frac{V2*T1}{V1}= \frac{235 mL * 105 ^{\circ}C }{455 mL}=54,23 ^{\circ}C$

So, the final temperature is 54,23 °C

Have a nice day!

5 0

3 years ago

Read 2 more answers