How many milligrams of ammonium nitrate are equivalent to 7.42 x 10-5 kg of ammonium nitrate?

Select one:
a. 7.42 x 10-7
b. 7.42 x 101
c. 7.42 x 104
d. 7.42 x 107
e. 7.42 x 1010

7.42E-5 kg x (1000g/1 kg) x (1000 mg/g) = ?

looks ok to me.

To convert kg to mg, you need to multiply the value by 1,000,000.

Given:
Mass of ammonium nitrate = 7.42 x 10^-5 kg

To convert to milligrams, multiply by 1,000,000:
7.42 x 10^-5 kg * 1,000,000 mg/kg = 7.42 x 10^-5 * 1,000,000 mg
= 74.2 mg

Therefore, 7.42 x 10^-5 kg of ammonium nitrate is equivalent to 74.2 milligrams (mg). In scientific notation, this is expressed as 7.42 x 10^1 mg.

The correct answer is b. 7.42 x 10^1.

To determine the number of milligrams equivalent to 7.42 x 10^-5 kg of ammonium nitrate, we need to convert kilograms to milligrams.

1 kilogram (kg) is equal to 1,000,000 milligrams (mg).

So, to convert kilograms to milligrams, we multiply the given quantity (7.42 x 10^-5 kg) by 1,000,000.

7.42 x 10^-5 kg * 1,000,000 = 7.42 x 10^-5 * 1,000,000 kg = 7.42 x 10^-5 * 10^6 kg = 7.42 x 10^-5+6 kg = 7.42 x 10^1 kg

Therefore, 7.42 x 10^-5 kg of ammonium nitrate is equivalent to 7.42 x 10^1 mg.

Since 7.42 x 10^1 is not one of the answer choices, none of the options provided is correct.