1. How many atoms are in 0.25 moles of carbon? 2. How many atoms are in 12.3 grams of sodium?

3. How many grams are there in 0.52 moles of boron?

4. How many grams are there in 2.0 moles of HCl?

5. How many moles are in 3.4 grams of HBr?

6. How many grams are there in 4.5x10^10 atoms of NaCl?

7. How many atoms are there in 45.1 grams of MgO?

Which statement best describes the relationship between period and frequency of light waves? a) in wave b the period increases and the frequency decreases from wave a. b) in wave a the period increases and the frequency decreases from wave b. c) in wave b the period is shorter and the frequency is greater than in wave a. d) in wave a the period is shorter and the frequency is greater than in wave b.

What type of reaction is shown below? check all that apply. 2h2o2 → 2h2o + o2 synthesis decomposition combustion

Fill in the coefficients that will balance the following reaction: a0cr2(so4)3 + a1agno3