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Mole Calculation Practice Worksheet Answer the following questions: 1) How many moles are in 25.0 grams of water? 2) How many grams are in 4.500 moles of Li 2O? 3) How many molecules are in 23.0 moles of oxygen? 4) How many moles are in 3.4 x 10 23 molecules of H 2SO 4? 5) How many molecules are in 25.0 grams of NH 3?
Moles. Q1: What are the units chemical quantities are often measured in? Q5: What is numerical value of the Avogadro constant? (1 mark) Q6: What is the value of the Avogadro constant? (1 mark) Amounts of substances in equations. The masses of substances in an equation can be calculated using the following equation: . =
What is a Mole? The value of a mole is fixed, it does not change with the substance being discussed, i.e. one mole of iron, one mole of electrons, and one methane molecules both contain 6.022 \times 10^ {23} particles. This number is known as the Avogadro constant and is typically give the symbols L or NA.
Use the formula below to answer questions 1- 4 3Cu + 8HNO 3 3Cu(NO 3) 2 + 2NO + 4H 2 O 1. What is the mole ratio of copper to nitrogen monoxide in this reaction? 2. If 1.50 moles of copper are used, how many moles of NO are produced? 3. If 4.50 moles of HNO 3 are used, how many moles of copper (II) nitrate are produced? 4.
Calculate the mass of carbon you would need to reduce 15.9 g of copper (II) oxide to copper by the following reaction. Reaction CuO + C ⎯ → Cu + CO Mole ratio Mr (g mol-1) Mass (g) Amount (mol) Iron will react with chlorine to form iron (III) chloride.
26 lut 2024 · Moles = Mass/Mr | AQA GCSE Chemistry Practice Questions. 1) What mass of hydrogen is produced when 192 g of magnesium is reacted with hydrochloric acid? Mg + 2 HCl → MgCl 2 + H 2 (3 marks) 2) What mass of oxygen is needed to react with 8.5 g of hydrogen sulphide (H 2 S)? 2 H 2 S + 3 O 2 → 2 SO 2 + 2 H 2 O (3 marks)
26 cze 2020 · This resource covers the skills in the AQA specification 4.3.2. The objectives of this resources are: • To describe in what units are chemical amounts measured. • To use the relative formula mass of a substance to calculate the number of moles in a given mass of that substance. • To practice balancing equations.
