NEED HELP ASAP 20 POINTS What does a subscript in a chemical formula tell you? For example the 3 in Rb3PO4 the number of atoms of the element symbol it follows the number of atoms of the element symbol it is in front of the number of molecules​

The answer should be A

Explanation:

because the definition of a subscript is that they indicate the number of atoms of an element present in am molecule or formula unit.

The first choice. The rule is go left. Those subscript numbers always talk about the element to the left of them.

Explanation:

The straight forward answer is the first one.

You should always answer that when reading the chemical make up of molecules. Let's look at some examples.

C8 H18

Consider the 8. It must be describing how many carbons there are. If it was meant for the hydrogen, then what  does the 18 mean? You wouldn't know.

Now look at something a lot more complicated.

Mg3(PO4)2

Use the going left rule. That satisfies Mg doesn't it? There are 3 of them and 3 is correct.

The two at the end is also straightforward if you think about it. It must be telling you how many molecules are in the brackets. If that were not so, then you wouldn't be able to tell what it did. So there are 2 PO4

But you still have the 4 to deal with. Use the going left rule again. 4 must be telling you how many oxygens you have inside the brackets. There are 4 of them.

here's the link to your question!

explanation:

first let us lay out the formula for potential

and kinetic energy:

pe = mgh

ke = (mv^2)/2

where: m=mass, v=velocity, g=gravitational

acceleration, h=height

calculating for mass using the known values of

pe:

340j = m (9.81 m/s^2) (50ft) (1m/3.28ft)

m = 2.27 kg

the law of conservation of energy states that

energy is neither created nor destroyed. therefore, the change in kinetic

energy from 50 ft to 35 ft would be equal to the change in potential energy

from 50 ft to 35 ft. however it would be opposite in signs since one is losing

while other is gaining.

ke(35ft) – ke(50ft) = - [ pe(35ft) – pe(50ft]

ke(50ft) = 0 since the brick is initially at rest

ke(35ft) = 340j - 2.27kg (9.81 m/s^2) (35ft)

(1m/3.28 ft)

ke(35ft)

= 102.38 j