Use exponential (scientific) notation to express the value 385,500 to 1 s.f.

1 answer:

7 0

To express the value 385 500 in scientific notation with 1 significant figure we have to move the decimal point to the left until we're left with a number between 1 and 10:

385500.0

38550.00 (1 space)

3855.000 (2 spaces)

385.5000 (3 spaces)

38.55000 (4 spaces)

3.855000 (5 spaces)

The number of spaces we moved to the left, is going to be the exponent of the number 10 that we are going to multiply to that number

3.855000*10⁵

Finally, we round the number so we have only one number different from 0 and this is the number expressed with scientific notation to 1 significant figure:

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Explanation:

1. To calculate the mass, you know you can convert by using molar mass. Since mass is in grams, we can use molar mass to convert moles to grams. This calls for the Ideal Gas Law.

Ideal Gas Law: PV=nRT

We manipulate the equation so that we are solving for moles, then convert moles to grams.

n=PV/RT

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Now that we have our values listed, we can plug in to find moles.

$n=\frac{(100kPa)(0.831L)}{(8.31kPa*l/molK)(300K)}$