If a copper wire is 195 cm long what is the length in inches? a) 76.8 in. b) 13.0

A) 76.8 in

Explanation:

The length is the measure of the extent of an object from one end to the another. The SI unit is meters. There are also other units of length like inches, feet, centimeter, kilometer, miles, etc.

The conversion of cm into inches is shown below as:

Given length = 195 cm

So,

Option A is correct.

B:H ratio is 1:3

Explanation:

The empirical formula is BH₃.

If you have 100 g of the compound.

Then you have 78.14 g B and 21.86 g H.

Now, we must convert these masses to moles and find their ratios.

From here on, I like to summarize the calculations in a table.

Element  Mass/g    Moles     Ratio     Integers

    B          78.14      7.2285    1                    1

    H          21.86    21.686      3.0001          3

The empirical formula is BH₃.