Please show the calculations. 1) 1.3 g of zinc reacts with excess sulphuric acid. Calculate the volume of hydrogen gas formed at s. tp. (Zn = 65, 1 mole of gas occupies a volume of 22.4 dm³ at s. t.p.).
A. 112cm³
B. 224cm³
C. 336cm³
D. 448cm³
2) Calculate the volume of sodium hydroxide of concentration 0.5 mol dm¯³ needed to neutralize 25.0cm³ sulphate acid of concentration 0.20mol dm¯³.
A. 10cm³
B. 20cm³
C. 25cm³
D. 50cm³​

Agroup of students is studying convection currents. they fill two identical balloons with the same amount of helium. one balloon is placed in a freezer and the other in an area with warm air. after 10 minutes, the balloons are released from a height of 1 meter. which of the following do the students most likely observe? a. the balloons both rise. the cold balloon is larger than the warm balloon. b. the balloons rise at the same rate. both balloons are the same size. c. the warm balloon expands and rises. the cold balloon shrinks and sinks. d. the cold balloon expands and rises. the warm balloon shrinks and sinks.

Think about how you can use le chatelier’s principle to find possible solutions to the design problem. describe at least two ways to increase the yield (amount) of ammonia based on this principle.

What are the spectator ions in 2h+ + so42- + ca2+ + 2r → caso4 + 2h+ + 21?