How do you write 0.000157 in scientific notation

Melissa is interested in her family tree and how her family has changed over its many generations. melissa probably more closely resembles

Water is initially present in a state where its molecules are far apart. during a change of state, its molecules slow down. which change of state has most likely taken place? from a gas to a liquid from a liquid to a gas from a solid to a liquid from a gas to a plasma

How many moles are in 123.0 grams of kclo4?