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Softa [21]
3 years ago
15

If 2.9g of water is heated from 23.9C to 98.9C, how much heat (in calories) was added to the water?

Chemistry
1 answer:
tensa zangetsu [6.8K]3 years ago
7 0

Answer:

Explanation:

we know that

ΔH=m C ΔT

where ΔH is the change in enthalpy (j)

m is the mass of the given substance which is water in this case

ΔT IS the change in temperature and c is the specific heat constant  

we know that given mass=2.9 g

ΔT=T2-T1 =98.9 °C-23.9°C=75°C

specific heat constant for water is 4.18 j/g°C

therefore ΔH=2.9 g*4.18 j/g°C*75°C

ΔH=909.15 j

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Which of the following acts as a catalyst in catalytic converters?
Serhud [2]

Answer:

B. Metal

Explanation:

The catalyst used in the converter is mostly a precious metal such as platinum, palladium and rhodium. Platinum is used as a reduction catalyst and as an oxidation catalyst. Although platinum is a very active catalyst and widely used, it is very expensive and not suitable for all applications.

Hope it helps plz mark brainlist :)

5 0
3 years ago
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How many moles in one gram of Calcium ??
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Answer:

0.0249 moles in 1 g of Ca

Explanation:

Let's think in the molar mass of Ca.

Ca = 40.08 g/mol

So 1 mol weighs 40.08 grams, or in the opposite 40.08 grams is the weigh of 1 mol

The rule of three will be:

40.08 g are contained in 1 mol

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8 0
3 years ago
You take a very hot block of metal on top of a cold block of metal. What will
allochka39001 [22]

Answer:

They will both cool down overtime

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6 0
3 years ago
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14.Sorbitol is used in sugar free gums as a sweetener. After analysis, a sample of
evablogger [386]
<h3>Answer:</h3>

C6H12O6

Explanation:

To find empirical formular you write out the element

Carbon Hydrogen Oxygen

3.96 769 5.28

then u althrough divide by their atomic numbers

3.96÷ 12 769÷1 5.28÷16

=0.33 =769 =0.33

also divide althrough by the lowest number

the lowest number is 0.33 so we use it to divide

0.33÷0.33. 769÷0.33. 0.33÷0.33

= 1 = 2 = 1

empirical formular= CH2O

To find the Molecular formular

Molecular number = molar mass

(CH2O)n = 182

(12+1×2+16)n = 182

30n = 182

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therefore the Molecular formular is C6H12O6

3 0
2 years ago
How does radon move up through rock and soil?
vova2212 [387]
The gas naturally moves into permeable soil and gravel through cracks, pores, open space, etc.
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3 years ago
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