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CaHeK987 [17]
3 years ago
8

A piece of tin has a mass of 16.52 g and a volume of 2.26 cm3 what is the density of tin?

Chemistry
1 answer:
boyakko [2]3 years ago
7 0

Answer:

The density of tin is 7.31 g/cm³.

Explanation:

Given that the formula of density is D = m/v where m represents mass and v is volume :

D = 16.52/2.26

D = 7.31 g/cm³ (3sf)

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Calculate the amount of heat required to raise the temperature of a 24 g sample of water from 9°C to 23°C.
borishaifa [10]

Answer:

1400KJ/mol⁻¹

Explanation:

Amount of heat required can be found by:

Q = m × c × ΔT

<em>Where m is the mass, c is the specific heat capacity (4.2KJ for water) and ΔT is the change in temperature.</em>

Q = 24 × 4.2 × (23 - 9)

= 24 × 4.2 × 14

=   1411.2KJ/mol⁻¹

= <u>1400KJ/mol⁻¹</u>  (to 2 significant figures)

7 0
3 years ago
Calculate the work, w, gained or lost by the system when a gas expands from 15 L to 45 L against a constant external pressure of
marta [7]

Answer:

Work done by the system = 4545 J

Explanation:

The expression for the calculation of work done is shown below as:

w=-P\times \Delta V

Where, P is the pressure

\Delta V is the change in volume

From the question,  

\Delta V = 45 - 15 L = 30 L

P = 1.5 atm

w=-1.5\times 30\ atmL

Also, 1 atmL = 101 J

So,  

w=-1.0\times0.75\times 101\ J=-4545\ J (negative sign implies work is done by the system)

<u>Work done by the system = 4545 J</u>

6 0
3 years ago
How many atoms of oxygen are in hydronium?
8090 [49]

Answer:

hi

Explanation:

23

8 0
3 years ago
Read 2 more answers
A common demonstration in chemistry courses involves adding a tiny speck of manganese(IV) oxide to a concentrated hydrogen perox
Nuetrik [128]

Answer:

2H_{2}O_{2} ---> 2H_{2}O + O_{2}

2,2,1 being the coefficients

Explanation:

These type of question rely on the person answering the question knowing the formula of hydrogen peroxide. Hydrogen peroxide has a formula that is very similar to that of water except it has a two after the O, which makes it very easy to remember.

6 0
3 years ago
I need help on this<br>all of them plz
yaroslaw [1]
For the first question it would be a unit obtained from the change in velocity per unit of time or m/s^2.

The vf and vi represent the final and initial velocity of the object and or item.

Knowing the formula for acceleration is simply change in velocity divided by time

Vi = 0
Vf = 27 m/s
t = 10 s

Vf = vi + at

27 = 10a

a = 27/10 or 2.7 m/s^2.
6 0
3 years ago
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