3 years ago

if the energy in a serving of food can heat up 450,000 grams of water 1°C, how many Calories are in the serving?

Chemistry

1 answer:

ahrayia [7]3 years ago

3 0

I don’t know?I think but I’m not sure

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Name the subatomic particles contained in the nucleus of the atom

lawyer [7]

Neutron, proton
form those are both quarks

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3 years ago

Which of the following are considered pure substance??

Shkiper50 [21]

Answer:

Explanation:

I’m 99.9% sure that it’s an element because it can’t be broken down any more than it already is.

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4 years ago

If a patient requires 30g/day of some medication and it comes in 500 mg tablets , how many tablets does this patient need in one

Anna11 [10]

Since 1000 mg=1g
500mg=?
500/1000*1g=0.5g
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4 years ago

How many atoms of N are in 0.82 g of NaNO3? ( molar conversion)

VMariaS [17]

The number of atoms N = 5.8 x 10²¹

<h3>Further explanation</h3>

A mole is a unit of many particles (atoms, molecules, ions) where 1 mole is the number of particles contained in a substance that is the same amount as many atoms in 12 gr C-12

1 mole = 6.02.10²³ particles

mass of N in 0.82 g of NaNO₃ (MW NaNO₃: 85 g/mol) :

$\tt mass~N=\dfrac{Ar~N}{MW~NaNO_3}\times mass~NaNO_3\\\\mass~N=\dfrac{14}{85}\times 0.82\\\\mass~N=0.135~g$