WILL GIVE BRAINLIEST! AND 20 POINTS! Calculate the number of moles of the indicated substance in each of the following samples.
A. 4.26 x 1 0-3 g of sodium dihydrogen phosphate
B. 521 g of copper(I) chloride
C. 151 kg of iron
D. 8.76 g of strontium fluoride
E. 1.26 x 1 04 g of aluminum

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.

Sarah wants to know where in her garden chamomile would grow the best. she thinks chamomile will grow best in the corner of the garden that gets the most sunlight. to test her hypothesis, she decides to plant several groups of chamomile in her garden as an experiment. which of the following variables will sarah need to measure to know which group of plants grew best? a. the location of the plants b. the type of plants c. the height of the plants d. the amount of water she gives the plants

One similarity and one difference between an element and a mixture of elements