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3 years ago

12

Why do we need to convert mass to moles in stoichiometry problems.

1 answer:

laiz [17]3 years ago

7 0

Since a mole represents a large number of molecules, it is not possible to count the number of molecules directly, the only method is through weight. The mass is converted to moles so that the number of molecules in the reaction are kept track of.

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What are cirrus.cirrostratus. And cirrocumulus clouds made up of

Irina-Kira [14]

<span><span>1. </span>All clouds are made up of tiny ice crystals or small water droplets that form together with a dust on the atmosphere.
Cirrus, cirrostratus and cirrocumulus are made up of ice crystals. It forms when the water vapor goes condensation at high altitudes in where the pressure on the atmosphere reaches the point from 600 mbar at 4000 meter above the sea level up to 200mbar at 12 000m above sea level. These clouds form thunderstorms, cyclones and contrails (a manmade cloud).</span> <span>

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4 years ago

The specific heat(c) of copper is 0.39 J/g °C. What is the temperature change(∆t) when 200 Joules of heat(Q) is added to 10 gram

andrew11 [14]

Answer:

7.8 J/g °C

Explanation:

0.39 J/g °C x 200 J / 10g

= 7.8 J/g °C

3 0

4 years ago

Read 2 more answers

A uniform stick 1.5 m long with a total mass of 250 g is pivoted at its center. A 3.3-g bullet is shot through the stick midway

Andru [333]

Answer:

<em>63.44 rad/s</em>

<em></em>

Explanation:

mass of bullet = 3.3 g = 0.0033 kg

initial velocity of bullet $v_{1}$ = 250 m/s

final velocity of bullet $v_{2}$ = 140 m/s

loss of kinetic energy of the bullet = $\frac{1}{2}m(v^{2} _{1} - v^{2} _{2})$

==> $\frac{1}{2}*0.0033*(250^{2} - 140^{2} )$ = 70.785 J

this energy is given to the stick

The stick has mass = 250 g =0.25 kg

its kinetic energy = 70.785 J

from

KE = $\frac{1}{2} mv^{2}$

70.785 = $\frac{1}{2}*0.25*v^{2}$

566.28 = $v^{2}$

$v= \sqrt{566.28}$ = 23.79 m/s

the stick is 1.5 m long

this energy is impacted midway between the pivot and one end of the stick, which leaves it with a radius of 1.5/4 = 0.375 m

The angular speed will be

Ω = v/r = 23.79/0.375 =<em> 63.44 rad/s</em>

5 0

3 years ago

What property of matter is measured in cubic centimeters

Soloha48 [4]

Volume is measured in cubic centimeters. Hope this helped.

8 0

4 years ago

Read 2 more answers

A jogger accelerates from rest to 3.0 m/s in 2.0 s. A car accelerates from 38.0 to 41.0 m/s also in 2.0 s. (a) Find the accelera

Tom [10]

Answer:

a) The acceleration of the jogger is 1.5 m/s²

b) the acceleration of the car is also 1.5 m/s²

c) Yes, the car travels 76 m farther than the jogger.

Explanation:

a) The acceleration of an object is the variation of its velocity over time:

a = final velocity - initial velocity / time

for the jogger:

a = 3.0 m/s - 0 m/s / 2.0 s = <u>1.5 m/s ²</u>

b) For the car:

a = 41.0 m/s - 38.0 m/s / 2.0 s = <u>1.5 m/s²</u>

c) Let´s see the position of the car after 2 seconds.

The equation for the position of an accelerated object moving in a straight line is:

x = x0 + v0* t +1/2 * a * t²

Where:

x = position of the car at time "t"

x0 = initial position

v0 = initial velocity

t = time

a = acceleration

Let´s consider x0 = 0 because the origin of the reference system is located where the car starts accelerating. Then:

x = 38,0 m/s * 2 s + 1/2 * 1.5 m/s ² * (2.0 s)²

x = 79 m

In the same way, we can calculate the position of the jogger:

x = 0 m/s * t + 1/2 * 1.5 m/s ² * (2.0 s)²

x = 3 m

<u>The car travels 79 m - 3 m = 76 m farther than the jogger</u>

4 0

3 years ago