A student graphed distance versus time for an object that moves 14 every 2 s. What is the speed of the object?

1 answer:

3 0

The speed would be 7 every second. If you are trying to find how far it moves per second you would divide 14 by 2 since you know it move 14 in 2 seconds.

I’m not sure if that was what you were looking for since the question is not super specific and there’s not unit other than seconds.

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The molarity of a solution containing 7.1 g of sodium sulfate in 100 mL of an aqueous solution is

Sergio [31]

Answer:

0.5 M

Explanation:

First we have to start with the molarity equation:

$M=\frac{mol}{L}$

We need to know the amount of moles and the litters.

If we have 100 mL we can convert this value to “L”, so:

$100~mL\frac{1~L}{1000~mL}$

$0.1~ L$

Now we can continue with the moles, for this we have to know the formula of sodium sulfate $Na_2SO_4$ , with this formula we can calculate the molar mass if we know the atomic mass of each atom on the formula (Na: 23 g/mol, S: 32 g/mol, O: 16 g/mol). We have to multiply each atomic mass by the amount of atoms in the formula, so: