Visit Macau and mainland China

Hi Sir/Madam
I am Mohamed Nasser from Yemen. Currently, I am working as a professor in a University in Saudi Arabia.
I want to attend a conference in Macau from August 2-8, then I want to go to Beijing to attend a conference there from August 10-14.
1. Can I apply for one visa to visit Macau and China or should I apply for two separate ones?
2. I am from Yemen, but working in Saudi Arabia. Can I apply in China embassy in Saudi Arabia.