All categories

2 years ago

How much energy has your body used, in joules, if your health

Chemistry

1 answer:

Verdich [7]2 years ago

8 0

Answer:

1,882.8 joules
83.652 calories

Explanation:

Given:

Amount in calories = 450 calories

Amount in joules = 3.5 × 100 joules

Find:

Change in joules
Change in calories

Computation:

We know that,

1 calories = 4.184 joules

So,

Amount in calories = 450 calories

= 450 × 4.184

= 1,882.8 joules

Amount in joules = 3.5 × 100 joules

= [3.5 × 100] / 4.184

= 83.652 calories

You might be interested in

How many grarns would 3 moles of carbon dioxide (CO2) weigh? (round to the

BigorU [14]

Mass of CO₂ = 132 g

<h3>Further explanation </h3>

A mole is a number of particles(atoms, molecules, ions) in a substance

This refers to the atomic total of the 12 gr C-12 which is equal to 6.02.10²³, so 1 mole = 6.02.10²³ particles

Can be formulated :

N = n x No

N = number of particles

n = mol

No = 6.02.10²³ = Avogadro's number

mole also can be formulated :

$\tt n=\dfrac{mass}{MW}$

moles of CO₂ = 3

mass of CO₂(MW=44.01 g/mol) :

$\tt mass=mol\times MW\\\\mass=3\times 44.01\\\\mass=132.03~g\approx 132~g$

6 0

2 years ago

Mixing magnesium and aluminum together produces an excellent lightweight material from which to make airplane parts what is this

Zielflug [23.3K]

<span>Mixing magnesium and aluminum together produces an excellent lightweight material from which to make airplane parts. This type of mixture is called an alloy.
Alloy is a mixture of two elements, one of which is a metal.
</span>

7 0

2 years ago

Read 2 more answers

What monomer is polymerized to make acrylate? What is the chemical name for this popular polymer?

lawyer [7]

Lucite ,also called plexiglas,British Perspex,trademark name of polymethyl methacrylate.a synthetic organic compound of high molecular weight made by combination of many simple molecules of the ester methyl methacrylate(monomer)into long chains (polymer) the process (polymerization) may be effected by light or etc.

3 0

3 years ago

Read 2 more answers

What is the composition, in atom percent, of an alloy that consists of a) 5.5 wt% Pb and b) 94.5 wt% of Sn? Assume that the atom

Anastaziya [24]

Answer : The percent composition of Pb and Sn in atom is, 3.21 % and 96.8 % respectively.

Explanation :

First we have to calculate the number of atoms in 5.5 wt% Pb and 94.5 wt% of Sn.

As, 207.2 g of lead contains $6.022\times 10^{23}$ atoms

So, 5.5 g of lead contains $\frac{5.5}{207.2}\times 6.022\times 10^{23}=1.59\times 10^{22}$ atoms

and,

As, 118.71 g of lead contains $6.022\times 10^{23}$ atoms

So, 94.5 g of lead contains $\frac{94.5}{118.71}\times 6.022\times 10^{23}=4.79\times 10^{23}$ atoms

Now we have to calculate the percent composition of Pb and Sn in atom.

$\% \text{Composition of Pb}=\frac{\text{Atoms of Pb}}{\text{Atoms of Pb}+\text{Atoms of Sn}}\times 100$

$\% \text{Composition of Pb}=\frac{1.59\times 10^{22}}{(1.59\times 10^{22})+(4.79\times 10^{23})}\times 100=3.21\%$

and,

$\% \text{Composition of Sn}=\frac{\text{Atoms of Sn}}{\text{Atoms of Pb}+\text{Atoms of Sn}}\times 100$

$\% \text{Composition of Sn}=\frac{4.79\times 10^{23}}{(1.59\times 10^{22})+(4.79\times 10^{23})}\times 100=96.8\%$

Thus, the percent composition of Pb and Sn in atom is, 3.21 % and 96.8 % respectively.

6 0

3 years ago

Which power source directs the electrons from oxidation-reduction reactions to flow through a device to give the device power? O

Lady bird [3.3K]

Answer:

B. A battery.

Explanation:

I just took the test

4 0

2 years ago