109 Answered Questions for the topic mass

03/28/19

What is the maximum mass of the precipitate formed when 127 mL of 2.1 M potassium phosphate reacts with magnesium chloride?

2 K_3PO_4 (aq) + 3 MgCl_2 (aq) = Mg_3(PO_4)_2 (s) + 6 KCl (aq)
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02/27/19

How many grams of nitrogen are there in a sample of nitrogen that contains 4.0 moles of nitrogen atoms?
Plz help this is due tomorrow and I keep getting stuck on this problem !!!
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02/22/19

What mass of O_2 gas must be produced in order for 4.5 L of NaOH to react completely at STP?
According that H_2O reacts with Na_2O_2 according to the following equation:2Na_2O_2 + 2H_2O yields 4NaOH + 1O_2
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09/14/18

How does the mass of an object affect the outcome when an unbalanced force acts on it?
How does the mass of an object affect the outcome when an unbalanced force acts on it?
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08/21/18

[Math] Finding density of the object
Approximate the volume of each object whose mass is given. Then find the mass per unit of volume, or density, of each object.   The problem is, I don't know where to... more
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06/03/18

How to find the weight of the air inside a ball?
I know the radius including the outside layer or "shell" of the basketball is 0.1205m and without is 0.1075m. The inflation pressure is 55158.06 N/m2 in Pascals. 
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03/20/18

Mass of Aspirin in a tablet
In a lab determining the mass of acetylsalicylic acid in an aspirin tablet, I'm having trouble with the dilution part of my calculation.   An unknown solution was made by placing an aspirin... more
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01/30/18

Calculate the Partial pressure of each gas at STP, and calculate the density at STP.
At STP, air can be considered to be a mixture of ideal gases: 21.1% O<sub>2</sub>, 78.0% N<sub>2</sub> and 1.00% Ar by volume.   a) Calculate the partial pressure of each... more
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Mass

01/27/18

What is the mass in grams of a cube of gold (density = 19.32g/cm3) if the length of the cube is 2.00cm?
What is the equation set up?
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01/16/18

what is the momentum of a system of two particles
What is the momentum of a system of two particles with these respective masses and velocities: 3.75 kg moving north at 5.6m/s and 4.2 kg moving northwest at 2.3m/s?
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01/15/18

What is the radius of the circle?
A car is turning on a circular path with a constant speed of 7 m/s. If the car mass is 1200 kg and the coefficient of static friction is between the cars tires and the road .68 what is the radius... more
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12/06/17

Can someone help me with Mole Conversion?
I'm struggling to understand on how to do this, I'm currently trying to use dimensional analysis to solve the problems, please help.   1. What is the mass of 12.5 moles of silicon?   2. How... more
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11/18/17

Find the acceleration of the books:
A Student moves a box of books with a rope by pulling the rope with a force of 90 N at an angle of 30°.   The books have a mass of 20 kg and a coefficient of friction between the box and floor is... more
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11/15/17

what is the empirical formula?
the compound xylene consists of 90.49% C and the rest is hydrogen.What is the empirical formula?
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11/14/17

determine the mass of the sample
1.48 mol carbon tetrafluoride 
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11/13/17

Calculate the mass percent composition of each element in each compound.
FeCl3   Mass % of Fe, Cl   Express your answer using four significant figures
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11/09/17

PLEASE TELL ME HOW TO WORK IT OUT, DON'T TELL ME THE ANSWER,THANK YOU!
If you dissolve 300 g of salt in 10 litres of water, what is the density of that solution of salty water? In this particular example, assume that the total volume doesn’t change when salt is added... more
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10/24/17

Doctors use radioactive iodine as a tracer in diagnosing certain thyroid gland disorders. This type of iodine decays in such a way that the mass remaining after
m(t) = 6e−0.087t where m(t) is measured in grams.   a) Find the initial mass (mass at time t = 0).   b) How much of the mass remains after 20 days?  
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10/21/17

Question concerning molarity, volume and mass, please help!
If 10 drops of 0.5 mol L-1 Na3PO4(aq) had been added to the sample containing excess 0.25 mol L-1 Ca(NO3)2(aq), what mass of precipitate would you expect to produce? You may assume one drop is... more
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Mass

09/28/17

the fuel tank of a truck has a capacity of 55 gal. if the tank is full of gasoline (sg=0.751)
sg=0.751   find mass and weight of the gasoline in SI units
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Mass

09/26/17

What is the mass of the bucket?
When 2 dozen cans of food are placed in a bucket, the mass is 4560g. When 18 cans of food are placed in the same bucket, the mass is 3480 g. What is the mass of the bucket?
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Mass

09/19/17

what is the mass in grams of an oak cube with the volume of 8 centimeters
it is a small cube and is wooden and it floatTS DENSITY MASS volume prediction result material grams centimeters 
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Mass Density

09/13/17

What is the mass of 15.0 cm3 of iron?
The density of iron is 7.86 g/cm3.  What is the mass of 15.0 cm3 of iron?
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08/31/17

What mass of oxygen gas is produced by the reaction of 5.2 g of water? Be sure to have the correct # of sig figs.
Green plants use light from the Sun to drive photosynthesis. Photosynthesis is a chemical reaction in which water (H2O) and carbon dioxide (CO2) chemically react to form the simple sugar glucose... more
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08/21/17

Energy in Simple Harmonic Motion help?
A .500 kg mass is oscillating on a spring with k= 330 N/m. The total energy of it's oscillation is 3.24 J. What is the speed of the mass when it is .100 m from the EP?
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