If the empirical formula of a compound is CH2, which of the following could be a possible molecular formula for this compound?

C2H2
CH
CH4
C2H4

In france, grapes are 1.95 euros per kilogram. what is the cost of grapes, in dollars per pound, if the exchange rate is 1.14 dollars/euro? (2.6)

The number at the end of an isotope’s name is the number.

Which of the following nuclei would be the least stable a 2 protons, 2 neutrons b 1 proton 1 neutron c 1 proton 3 neutrons d 1 proton 2 neutrons