4 years ago

How do you know if a element is neutral?

1 answer:

7 0

When the neutrons and electrons are the same. For example, sodium (Na) has an atomic mass of 11, meaning it has 11 protons and 11 electrons etc.

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How many grams of water are needed to dissolve 27.8 g of ammonium nitrate?

andreyandreev [35.5K]

The moles of ammonium nitrate needed to dissolve 0.35 moles
The moles of water that will react is 0.35 moles as due to ratio
so mass of water will be 0.35 x 18=6.3g
MASS OF WATER WILL BE 6.3 g

7 0

4 years ago

Convert 4.50 moles of Fe to atoms of Fe

olya-2409 [2.1K]

Each mole of a substance contains 6.02 x 10²³ particles
Atoms of Fe = 4.5 x 6.02 x 10²³
= 2.709 x 10²⁹ atoms

7 0

3 years ago

Does a reaction occur when aqueous solutions of chromium(III) bromide and manganese(II) nitrate are combined?

MissTica

Answer:

Yes the reaction occur when aqueous solutions happened

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3 years ago

Sheena wants to measure the volume of a ball that is 24 cm across. How should she set up her equation?

Ksivusya [100]

Answer:

The volume of a ball that is 24 cm across is :

d). v = four-thirds pi 12 cubed

Explanation :

Ball is a sphere and volume of sphere is given by :

$\frac{4}{3}\Pi r^{3}$

r = radius of ball

$r =\frac{24}{2}$

r = 12 cm

Volume is :

$\frac{4}{3}\Pi \times 12^{3}$

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4 years ago

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What is the density of platinum

Alex Ar [27]

Answer:

21.45 g/cm3

Explanation:

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3 years ago

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