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3 years ago

Will mark as Brainliest.

Chemistry

2 answers:

aleksandr82 [10.1K]3 years ago

5 0

Exactly what the other guy said except its in kJ on k12. So 0.33 kJ

xz_007 [3.2K]3 years ago

3 0

<span>The enthalpy of fusion of the ice is 334 J/g. .... When ice at 0°C melts to liquid water at 0°C, it absorbs0.334 kJ of heat per gram. ... A 2 kg block of ice is placed in a container at 0 °C. How much energy is required to completely melt the block of ice? ... A 40.0 g block of ice at -15 degrees C is dropped into acalorimeter </span><span>
</span>

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Inside the room the air is often warmer near the ceiling than near the floor. Which of the following accounts for the difference

Rudiy27

The correct answer would be C. Convection, which describes that heat rises.

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3 years ago

What is the volume of 4.78g of O2 gas at STP?

My name is Ann [436]

Answer:

Explanation:

The trick here is to realize that if you know the volume of a gas at STP, you can use the fact that

mole of any ideal gas occupies

22.7 L

under STP conditions to calculate how many moles of gas you have in your sample.

Under STP conditions:

1 mole of an ideal gas = 22.7 L

−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−

In your case, you know that your sample of gas occupies

2.28 L

under STP conditions, which are currently defined as a pressure of

100 kPa

and a temperature of

∘

This means that your sample will contain

2.28

⋅

molar volume of a gas at STP



1 mole gas

22.7

0.10044 moles gas

Now, the molar mass of the gas is the mass of exactly

mole of the gas. In your case, you know that you get

3.78 g

for every

0.10044

moles, which means that you have

mole

⋅

3.78 g

0.10044

moles

37.6 g

Since this is the mass of

mole of gas, you can say that the molar mass of the gas is

molar mass = 37.6 g mol

−

−−−−−−−−−−−−−−−−−−−−−−−

8 0

3 years ago

Read 2 more answers

Compared to the particles in a gas, the particles in a solid move

pentagon [3]

B. Slower than the gas is the answer

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3 years ago

When the equation Sn + HNO₃ → SnO₂ + NO₂ + H₂O is balanced in acidic solution, what is the smallest whole-number coefficient for

balu736 [363]

Answer:

Explanation:

Hello,

In this case, for the given reaction we first assign the oxidation state for each species:

$Sn^0 + H^+N^{5+}O^{-2}_3 \rightarrow Sn^{4+}O_2 + N^{4+}O^{2-}_2 + H^+_2O^-$

Whereas the half reactions are:

$Sn^0+2H_2O \rightarrow Sn^{4+}O_2 +4H^++4e^-\\\\H^++H^+N^{5+}O^{-2}_3 +1e^-\rightarrow N^{4+}O^{2-}_2+H_2O$

Next, we exchange the transferred electrons:

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