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grin007 [14]
3 years ago
9

How many moles are in 123.0 grams of KClO4? (3 points)

Chemistry
1 answer:
iVinArrow [24]3 years ago
5 0

Answer:

0.8878 mol KClO4

Explanation:

Molar mass of KClO4 = 39.0983 + 35.453 + ( 15.9994 x 4 ) = 39.0983 + 35.453 + 63.9976 = 138.5489g/mol

but,

number of moles = mass in grams / molar mass where mass in grams = 123g, molar mass = 138.5489g/mol

number of moles = 123g / 138.5489g/mol = 0.8878mol

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A bowl containing 150 grams of water, is heated from 25 °C to 100 °C.
rusak2 [61]

Answer:

47,070J

Explanation:

Because we use the formula

Eh= m×c×∆T

Which is energy required equals mass times specific heat capacity times change in tempreture (final temp - initial temp )

7 0
3 years ago
When H 2SO 4 is neutralized by NaOH in aqueous solution, the net ionic equation is ________. SO42- (aq) 2Na (aq) Na2SO4 (aq) SO4
puteri [66]

Answer:

2H+ + SO4^2- +2Na+ + 2OH- ------------> 2Na+ + SO4^2- + 2H2O

Explanation:

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6 0
3 years ago
Lead has a density of 11.3 g/cm3. what is the volume of a 15.1 g block of lead?
Crank
Hey there:

density = 11.3 g/cm³

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D = m / V

11.3 = 15.1 / V

V = 15.1 / 11.3

V = 1.336 cm³
8 0
3 years ago
7. A small roll of double-sided tape is 6.35m long and 1.2 x 102m wide. What is the total area that could be
allsm [11]

The total area that could be covered by this roll of tape is 0.1524 m².

<h3>What is the double-sided tape?</h3>

A double-sided tape is a tape that can be stick from both sides. It is used to stick something on a surface. A rectangle is an object that has four sides in which two sides are equal.

If we unroll the tape, we will see that it is a rectangle with dimensions:

length = 6.35 m

width = 1.2 x 10⁻² m

Since the tape has two sides, the total area of the tape is:

A = 2 x (length x width)

A = 2 x 6.35 x 1.2 x 10⁻²

A = 0.1524 m²

Thus, the total area of the tape is 0.1524 m²

To learn more about the area of rectangle, refer to the link:

brainly.com/question/8663941

#SPJ1

7 0
2 years ago
Where is most of the water on earth found? What percentage?
bezimeni [28]

Answer:

The ocean holds about 97 percent of the Earth's water; the remaining three percent is found in glaciers and ice, below the ground, in rivers and lakes. Of the world's total water supply of about 332 million cubic miles of water, about 97 percent is found in the ocean.

wait..if you asking about the country it's Brazil✌️

8 0
3 years ago
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