12. The molar mass of water is 18.0 g/mol. A mass of 90.0 grams of
water is equivalent to how many
moles?

HELP ASAP!!!

Calculate the change in entropy if br2(l) is converted into gaseous br atoms. s° for br2(l) = 152.2 j/(mol•k) s° for br2(g) = 245.5 j/(mol•k) s° for br(g) = 175.0 j/(mol•k)

The speed of light is around 6.706×10^8 miles per hour. what is the speed of light in units of miles per minute?

1) which of the following is the best example of a physical change? a) sugar dissolving in tea b) firefly glowing 2) in the combustion of ethane, what is/are the reactants? c2h6 + o2 ==> co2 + h2o a) c2h6 and o2 b) co2 and c2h6