How many grams of zno would you need to produce 50 g of zncl2? (the atomic mass of zn is 65.38 and of cl is 35.45.)

zno(s) + 2hcl(aq) → zncl2 (s) + h2o(l)

17.1 g
29.8 g
59.7 g
83.8 g

ZnO(s) + 2HCl(aq) → ZnCl2 (s) + H2O(l)

Look at the moles:

1 + 2 → 1 + 1

How much ZnO do we need to make 50g of ZnCl2? Notice it is these numbers in () and should be 1:1

(1) + 2 → (1) + 1

So we need the same number of moles, but how many moles is 50g of ZnCl2? Zn weight is 65.38g, and Cl is 35.45g. So ZnCl2 is (65.38) + (2 X 35.45)=136.28g

50g/136.28g = 0.3669 moles

What is 0.3669 moles of ZnO now?

O weighs 16g/mol, so add 65.38 + 16 = 81.38

Multiply by 0.3669 moles and get how many grams we need.

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i answered it first

you need to take a look at the periodic system in order to sort these elements into pairs that would most likely exhibit similar chemical properties. first, you need to find elements that are found in the same group (groups are vertical in the periodic system), and then to see whether they have the same valence number. if they meet these criteria, they will have similar properties.

the first pair: ne (neon) and kr (krypton), are noble gases found in group 8

the second pair: li (lithium) and k (potassium), found in group 1

the third pair: s (sulfur) and te (tellurium), found in group 6