How many atoms of hydrogen are present in 7. 63 g of ammonia (nh3)? select one: a. 2. 70 × 1023 b. 1. 52 × 1024 c. 1. 38 × 1025 d. 8. 09 × 1023 e. 1. 12 × 1020.

For each of the compounds below, show that the charges on the ions add up to zero. a. kbr b. cao c. li(2)o d. cacl(2) e. alcl(3)

Ahydrogen atom has 1 electron. how many bonds can hydrogen form? a) 1 b) 2 c) 3 d) 4 e) 5

Sodium sulfate dissolves as follows: na2so4(s) → 2na+(aq) + so42- (aq). how many moles of na2so4 are required to make 1.0 l of solution in which the na concentration is 0.10 m?