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Sveta_85 [38]
3 years ago
13

A 2.741 g sample of a new organic material is combusted in a bomb calorimeter. the temperature of the calorimeter and its conten

ts increase from 24.33 °c to 28.60 °c. the heat capacity (calorimeter constant) of the calorimeter is 25.57 kj/°c, what is the heat of combustion per gram of the material?
Chemistry
1 answer:
lakkis [162]3 years ago
7 0
(the heat bomb calorimeter gained)=(the heat material A gave)
r.h.s=25.57 kJ/⁰C * (26.80-24.33)= 63.16 kJ
2.741g of material A made 63.16kJ
the heat of combustion per gram = 63.16/2.741 kJ/g =24.04kJ/g
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Explanation:

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46g of a mineral contained 16g copper, 14g iron and 16g sulphur. Calculate the empirical
pochemuha

Answer:

CuFeS2

Explanation:

Calculate the moles of each substance by doing moles= mass/relative atomic mass. you should get 0.25 moles of copper and iron and 0.5 moles of sulfur. Then divide all of those numbers by 0.25 (as its the lowest value) you should get 1 for copper and iron and 2 for sulfur. This represents the ratio that they are in within the mineral.

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4 years ago
Which model is useful in showing the reactivity of potassium?
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Answer:we need the pic bro

Explanation:

6 0
3 years ago
Sally wants to find out the volume of water needed to fill her ice-cube tray. She can't find a measuring cup, but she does have
pochemuha

Answer:

3.2 cm X 2.8 cm X 2.6 cm/ 1 cube - not exact

1 mL - exact

1 cm³ - exact

12 cubes/ 1 tray - exact

268.8 mL/tray - not exact

Explanation:

We can use the picture attached below to solve this problem. The first part is not exact because Sally is using a ruler to measure the cube which would have a margin of error, regardless of how small. The \frac{1ml}{1cm^{3} } is exact, since that is the actual accurate exchange. Next, since there are 12 cubes in a single ice tray this measurement is also exact. Lastly, since Sally's initial measurement of the cubes is not exact, then the final calculated value will also not be exact.

5 0
3 years ago
What is the volume of a liquid with a density of 1.5 g/L and a mass<br> of 78 grams?
kirza4 [7]

Answer:

d =

m

V

m = d×V

V =

m

d

DENSITY

Density is defined as mass per unit volume.

d =

m

V

Example:

A brick of salt measuring 10.0 cm x 10.0 cm x 2.00 cm has a mass of 433 g. What is its density?

Step 1: Calculate the volume

V = lwh = 10.0 cm × 10.0 cm × 2.00 cm = 200 cm³

Step 2: Calculate the density

d =

m

V

=

433

g

200

c

m

³

= 2.16 g/cm³

MASS

d =

m

V

We can rearrange this to get the expression for the mass.

m = d×V

Example:

If 500 mL of a liquid has a density of 1.11 g/mL, what is its mass?

m = d×V = 500 mL ×

1.11

g

1

m

L

= 555 g

VOLUME

d =

m

V

We can rearrange this to get the expression for the volume.

V =

m

d

Example:

What is the volume of a bar of gold that has a mass of 14.83 kg. The density of gold is 19.32 g/cm³.

Step 1: Convert kilograms to grams.

14.83 kg ×

1000

g

1

k

g

= 14 830 g

Step 2: Calculate the volume.

V =

m

d

= 14 830 g ×

1

c

m

³

19.32

g

= 767.6 cm³Explanation:

3 0
3 years ago
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