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daser333 [38]
3 years ago
12

A runner completes a 400-meter race in 2.5 mins. What is the runner's average speed?

Chemistry
1 answer:
NNADVOKAT [17]3 years ago
8 0
The average speed is 160 meters a minute.
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120 grams of calcium nitrite Ca(NO2)2 is dissolved in a 240 mL solution. What is the molarity of the solution???
expeople1 [14]

Hey there!:

Molar mass Ca(NO2)2 = 132.089 g/mol

Mass of solute = 120 g

Number of moles:

n = mass of solute / molar mass

n = 120 / 132.089

n = 0.0009084 moles of Ca(NO2)2

Volume in liters of solution :

240 mL / 1000 => 0.24 L

Therefore:

Molarity = number of moles / volume of solution

Molarity = 0.0009084 / 0.24

Molarity = 0.003785 M

Hope that helps!

5 0
3 years ago
What is the name of the acid formed by PO4-3 anion?
djverab [1.8K]

Answer:

Phosphoric Acid would be your answer.

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3 years ago
This image was produced by a comouter it shoes conplext molecule consisting of many atoms
VashaNatasha [74]

Answer:

using a computer wont be as messy

Explanation:

4 0
1 year ago
What substance is acting as the Brønsted-Lowry base in the forward reaction below?
asambeis [7]
The question is asking to state the substance that is acting as the Bronsted Lowry base in the forward reaction, base on my research, I would say that the substance acting to said formulas is the NH3. I hope you are satisfied with my answer and feel free to ask for more if you have question and further clarification
3 0
3 years ago
What volume will 75 g of O2 occupy at STP?
Nady [450]

p = latm

t = 273.15K

R= 0.08206 L atm mol K

75.0g02

16.00 (O₂) = 4.6875mol mol

9

Ideal gas law: PV = nRT, solve for volume: V = nRT P

V =

4.6875mol 0.08206 L-atm mol. K · 273.15K

V = 105L

latm

3 0
3 years ago
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