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mote1985 [20]
3 years ago
6

Does anyone know the answer?

Chemistry
1 answer:
valentina_108 [34]3 years ago
3 0

An artery carries blood away from the heart, a vein carries blood to the heart.

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How much heat energy is required to melt 75g of ice at 0°C?
Mnenie [13.5K]

The enthalpy change for melting ice is called the entlaphy of fusion. Its value is 6.02 kj/mol. This means for every mole of ice we melt we must apply 6.02 kj of heat. We can calculate the heat needed with the following equation:

Q = N x ΔH

where:

Q  = heat

N  = moles  

ΔH  = enthalpy

In this problem we would like to calculate the heat needed to melt 35 grams of ice at 0 °C. This problem can be broken into three steps:


1. Calculate moles of water

2. multiply by the enthalpy of fusion

3. Convert kJ to J.


Step 1 : Calculate moles of water

[ 75g ] x (\frac{1 mol}{18.02g} ) =

Step 2 : Multiply by enthalpy of fusion

Q = N × ΔH  = <em> [ Step 1 Answer ]</em> ×  6.02 =

Step 3 : Convert kJ to J

[ Step 2 Answer ] x (\frac{1000j}{1kJ} ) =

Finally rounding to 2 sig figs (since 34°C has two sig figs) we get


Q Would Equal ____

4 0
3 years ago
In viewing a chemical equation, how do you determine the ratios that relate reactants and products?
4vir4ik [10]
In viewing a chemical equation,we <span>determine the ratios that relate reactants and products </span>from the coefficients of the reactants and products .
5 0
3 years ago
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in a plant 1.500kg of nitrogen oxide is consumed per day to produce 1.500 kg of nitrogen dioxide per day what is the percent yie
mafiozo [28]

Answer: The answer is 100%. Hope this helps :)

Explanation:

8 0
3 years ago
What are the answers to the solubility of various compounds worksheet
Cerrena [4.2K]

Answer:

i dont think i can help u with this

Explanation:

4 0
3 years ago
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Which of the following best defines one mole of a substance?
AlexFokin [52]

Answer: D. Amount of substance present in Avogadro‘s number of particles of the substance

Explanation:

According to avogadro's law, 1 mole of every substance occupies 22.4 Liters at STP, contains avogadro's number 6.023\times 10^{23} of particles and weighs equal to the molecular mass of that substance.

A mole is defined as the amount of substance that contains Avogardro number of the substance. Avogadro's number is given by 6.022\times 10^{23}.

1mole=6.022\times 10^{23} particles

4 0
3 years ago
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