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47 solutions

Mole Concept

Q. A sample of pure calcium weighing 1.35 gram was quantitatively converted to 1.88 g of calcium oxide... Find the atomic mass of calcium

Solved • Jul 26, 2019

Mole Concept

Q. How many hydrogen atoms are present in 75.0 of g H2O?

Solved • Jul 12, 2019

Mole Concept

Q. A 1.0 mL sample of seawater is determined to contain 2.5 × 10–14 moles of dissolved gold. The setup below will determine how many grams of gold are in 1.0 L of seawater.

Solved • Jul 9, 2019

Mole Concept

Q. How many moles of dipyrithione contain 4.6×10^24 atoms of nitrogen?

Solved • Jul 9, 2019

Mole Concept

Q. How many moles of dipyrithione are in 49.3 g?

Solved • Jul 9, 2019

Mole Concept

Q. In the following combustion reaction, 180 g of CO2 and 120 g of H2O is formed C2H6 + O2 -> CO2 + H2O a. Balance this equation b. Using the balanced equation, calculate the mass of carbon in the original sample c. Using the balanced equation, calculate the mass of hydrogen in the original sample.

Solved • Jul 1, 2019

Mole Concept

Q. how many cations are there in 30.0g of sodium phosphate?

Solved • Jun 17, 2019