The heat released from the combustion of 0.0500g of white phosphorous (P) increases the temperature of 150.00 grams of
water from 25.0°C to 31.5°C. Calculate the enthalpy change of the reaction in kJ per mole of phosphorous (water = 4.184
kJ/kg K)

- lead + phosphoric acid = hydrogen + lead(ii) phosphate

answer:

technetium is the most reactive. this is followed by silver. the least reactive out of these three elements is strontium.

the answer is c

tell me if wrong

answer is: nuclear fusion produces elements that are heavier than helium.

nuclei combine to form a heavier nucleus, releasing energy.  

for example, fusion of hydrogen atoms at the sun.  

this fusion nuclear reaction is in the inner core of the sun and hydrogen (atomic number 1) is conveted into helium (atomic number 2).  

the inner core is the central region of the sun and all solar energy is produced in the core by nuclear fusion.