Answers: 2
Chemistry, 22.06.2019 11:40
Modern pennies are composed of zinc coated with copper. a student determines the mass of a penny to be 2.482 g and then makes several scratches in the copper coaling (to expose the underlying zinc). the student puts the scratched penny in hydrochloric acid, where the following reaction occurs between the zinc and the hcl (the copper remains undissolved): zn(s) + 2 hcl(aq) → h2(g) + zncl(aq)the student collects the hydrogen produced over water at 25 °c. the collected gas occupies a volume of 0.899 l at a total pressure of 79 j mmhg. calculate the percent zinc (by mass) in the penny. (assume that all the zn in the penny dissolves.)
Answers: 1
Chemistry, 22.06.2019 12:00
Marcel just purchased 1.69 grams of iron fillings in order to make living putty for his 6 year old niece. how many moles of iron are made in his sample?
Answers: 1
Chemistry, 22.06.2019 19:50
A2.5% (by mass) solution concentration signifies that there is a 2.5 % (by mass) solution concentration signifies that there is blank of solute in every 100 g of solution. of solute in every 100 g of solution
Answers: 3
Chemistry, 23.06.2019 03:00
What happens in the particles of a gas when the gas is compressed
Answers: 1
What is how high or low you think a sound is...
Mathematics, 26.04.2021 23:00
History, 26.04.2021 23:00
English, 26.04.2021 23:00
Business, 26.04.2021 23:00
English, 26.04.2021 23:00
Mathematics, 26.04.2021 23:00
Mathematics, 26.04.2021 23:00
Mathematics, 26.04.2021 23:00
Arts, 26.04.2021 23:00
Mathematics, 26.04.2021 23:00
Mathematics, 26.04.2021 23:00
Mathematics, 26.04.2021 23:00