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2 years ago

What is the change in heat energy when 114.32g of water at 14.85oC is raised to 18.00oC?

Chemistry

1 answer:

iris [78.8K]2 years ago

8 0

Given:

114.32g of water

14.85oC is raised to 18.00oC

Required:

Change in heat energy

Solution:

This can be solved through the equation H = mCpT where H is the heat, m is the mass, Cp is the specific heat and T is the change in temperature.

The specific heat of the water is 4.18 J/g-K

Plugging in the values into the equation

H = mCpT

H = (114.32g) (4.18 J/g °C) (18 – 14.85)

H = 1,505.3 J

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How many molecules are in 3.6 grams of NaCl?

raketka [301]

Answer:

$\boxed{\text{None}}$

Explanation:

There are no molecules in NaCl, because it consists only of ions.

However, we can calculate the number of formula units (FU) of NaCl.

Step 1. Calculate the moles of NaCl

$\text{No. of moles}=\text{3.6 g NaCl}\times \dfrac{\text{1 mol NaCl}}{\text{63.54 g NaCl}} = \text{0.0567 mol NaCl}$

Step 2. Convert moles to formula units

$\text{FU} = \text{0.0567 mol NaCl} \times \dfrac{6.022 \times 10^{23}\text{ FU NaCl}}{\text{1 mol NaCl}}\\\\= 3.4 \times 10^{22} \text{ FU NaCl}$

There are $\boxed{3.4 \times 10^{22} \text{ FU NaCl}}$ in 3.6 g of NaCl.

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2 years ago

What is the moden periodic law

Zarrin [17]

Answer:

Here's what I get

Explanation:

The modern periodic law states that the physical and chemical properties of the elements are periodic functions of their atomic numbers.

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3 years ago

What does the atomic number ask

Alik [6]

I'm not sure what it asks, but it answers

how many protons are in the nucleus
how many electrons are in the atom
where it sits in the periodic table
If the periodic table is divided in the modern way, it gives a good indicator of whether you are speaking about a metal, a non metal or neither.

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3 years ago

Read 2 more answers

Are all glucose molecules chemically identical?

CaHeK987 [17]

Answer:

starch: A soft white chemical made by all green plants. It’s a relatively long molecule made from linking together a lot of smaller, identical building blocks — all of them glucose, a simple sugar. Plants and animals use glucose as an energy source. Plants store that glucose, in the form of starch, as a reserve supply of energy.

Explanation:

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2 years ago

A student preforms a chemical reaction in which 35 grams of hydrogen and 65 grams of oxygen reacted to form water. What is the m

tatuchka [14]

Answer:

Mass of water = 73.08 g

Explanation:

Given data:

Mass of hydrogen = 35 g

Mass of oxygen = 65 g

Mass of water = ?

Solution:

First of all we will write the balanced chemical equation:

2H₂ + O₂ → 2H₂O

Number of moles of hydrogen = mass/ molar mass

Number of moles of hydrogen = 35 g/ 2 g/mol

Number of moles of hydrogen = 17.5 mol

Number of moles of oxygen = 65 g / 32 g/mol

Number of moles of oxygen = 2.03 moles

Now we compare the moles of water with moles hydrogen and oxygen.

H₂ : H₂O

2 : 2

17.5 : 17.5

O₂ : H₂O

1 : 2

2.03 : 2× 2.03 =4.06 mol

Number of moles of water produced by oxygen are less so oxygen is limitting reactant.

Mass of water:

Mass of water = number of moles × molar mass

Mass of water = 4.06 mol × 18 g/mol

Mass of water = 73.08 g

8 0

3 years ago