PLEASE HELP, its for chem and i'm really stuck on this 1. How many moles are in 20 grams of o2 gas? 2. Find the mass in grams of 8.70 mol of NaOH. 3. What is the molar mass of C₂H₃O₂? 4. Find the number of mole in 6 grams of Gold? 5. How many atoms in 18 grams H₂O?
Please answer all of them, but if you can't at least the majority. EXTRA POINTS for this one :)

Construct the hypothetical phase diagram for metals a and b between room temperature (20c) and 700c, given the following information: * the melting temperature of metal a is 480c. • the maximum solubility of b in a is 4 wt% b, which occurs at 420c. • the solubility of b in a at room temperature is 0 wt% b. • one eutectic occurs at 420c and 18 wt% b–82 wt% a. • a second eutectic occurs at 475c and 42 wt% b–58 wt% a. • the intermetallic compound ab exists at a composition of 30 wt% b–70 wt% a, and melts congruently at 525c.• the melting temperature of metal b is 600c. • the maximum solubility of a in b is 13 wt% a, which occurs at 475c. • the solubility of a in b at room temperature is 3 wt% a.

What is the mass of each element in a 324.8 sample of co2

Which of the following is a conclusion that resulted from ernest rutherford’s scattering experiment? (will mark brainliest) a. the nucleus is negatively charged b. the atom is a dense solid and is indivisible c. the mass is conserved when atoms react chemically d. the nucleus is very small and the atom is mostly empty space