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Dahasolnce [82]
3 years ago
11

A student calculates the density of an unknown solid. The mass is 10.04 grams, and the volume is 8.21 cubic centimeters. How man

y significant figures should appear in the final answer?
(1) 1 (3) 3(2) 2 (4) 4
Chemistry
1 answer:
ludmilkaskok [199]3 years ago
7 0
10.04(g) has 4 significant figures, 8.21(cm^(3)) has 3 significant figures.

Since 3<4, we take the fewer one, which is 3.

Therefore, there should be 3 significant figures in the final answer.

Hope this would help~
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Find the mass that corresponds to each number of moles of iron oxide shown below.
Brrunno [24]

Answer: The 1st Option. ( 159.7g) On EDG.

Explanation:

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3 years ago
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when 949 J of heat is added to 9 grams of oil at 37˚C , the temperature increases to 62˚C. What is the specific heat of the oil?
Afina-wow [57]

Answer:

4.21778 J/(g*C)

Explanation:

specific heat = joules / (mass times temperature change)

949 / (9 times 25)

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4.21778

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2 years ago
Which of the following are acceptable ways to represent an isotope of carbon?
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4 years ago
Because of this, railroads use the reaction to provide molten steel to weld steel rails together when laying track. When 23.00g
k0ka [10]

Answer:

0.288 mole of Fe.

Explanation:

We'll begin by calculating the number of mole present in 23.00g of iron(III) oxide (Fe2O3). This can be obtained as follow:

Mass of Fe2O3 = 23 g

Molar mass of Fe2O3 = (56×2) + (16×3)

= 112 + 48

= 160 g/mol

Mole of Fe2O3 =?

Mole = mass /Molar mass

Mole of Fe2O3 = 23 / 160

Mole of Fe2O3 = 0.144 mole

Next, we shall write the balanced equation for the reaction. This is given below:

2Al + Fe2O3 —> Al2O3 + 2Fe

From the balanced equation above,

1 mole of Fe2O3 reacted to produce 2 moles of Fe.

Finally, we shall determine the number of mole of Fe produced by the reaction of 23 g (i.e 0.144 mole) of Fe2O3. This can be obtained as illustrated below:

From the balanced equation above,

1 mole of Fe2O3 reacted to produce 2 moles of Fe.

Therefore, 0.144 mole of Fe2O3 will react to produce = 0.144 × 2 = 0.288 mole of Fe.

Thus, 0.288 mole of Fe is obtained from the reaction.

7 0
3 years ago
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FinnZ [79.3K]
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We make use of these conversions through dimensional analysis. This approach is when you cancel out like units if they appear both on the numerator and the denominator side. The solution is as follows:

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Cancel out kilometers, meters, and liters. The final answer is in kilometers per liter. The complete solution, is therefore, 0.0329 miles/gal.
5 0
3 years ago
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