Answer:
The answer is
<h2>877 g</h2>
Explanation:
The mass of a substance when given the density and volume can be found by using the formula
<h3>mass = Density × volume</h3>
From the question
density = 19.3 g/cm³
volume = 44.9 cm³
The mass of the gold bar
mass = 19.3 × 44.9 = 866.57
We have the final answer as
<h3>877 g</h3>
Hope this helps you
Answer:
Explanation:
iron is element number 26 this means that it has 26 number of electron and proton in its atomic structure so its atomic number is 26
Answer:
<em><u>= 0.1 M </u></em>
Explanation:
450mL = 0.45L
If 24g of a solute are weighed by 1 mole of solute
1.2g of a solute will be weighed by ( 1.2 ÷ 24 )
=<u> 0.05 moles of a solute.</u>
0.45L of a solution are occupied by 0.05 moles
1L will be occupied by ( 1÷0.45 ) × 0.05
= 0.1 M
DNA
Nucleoulos
Nuclear Membrane
Answer:
a, b, c Flask B
Explanation:
The root mean square velocity of a gas is given by
V = √ ( 3RT/M)
where m is the molar mass, T is the temperature of the gas and R is the gas constant.
Therefore we have that the the velocity of the gas molecules is inversely proportional to the square root of the molar mass . That is the heavier the molecules the slower they will move which makes sense and the lower its kinetic energy.
The greater the velocity the more collisions the gas will have against the walls of the container.
The molar mass of CO and N2 are 28 g/mol while H2 is 2 g/mol. Hence hydrogen the lightest will have a greater kinetic enrgy, the greatest root mean square velocity and the greatest number of collisions with the wall of the container.
Notice that the pressure given for each is of the gases is different being the greatest for CO but pressure does not have an effect on the kinetic enery of the molecules.